EDA技术
EDA技术
杜某，男，4岁，乳牙
。乳磨牙近中关系，前牙反，下颌前伸，位置前移。
如果设计上颌垫活动矫治器矫治，垫的高度应使前牙打开
A:0mm B:0．5～1mm C:1～2mm D:2～3mm E:3～4mm
杜某，男，4岁，乳牙。乳磨牙近中关系，前牙反，下颌前伸，位置前移。
反解除后，双侧垫每次应磨除
A:0．5mm以内 B:0．5～1．0mm C:0～2．0mm D:1／3 E:1／2
Text 1
| Every living thing has an inner
biological clock that controls behavior. The clock works all the time; even when
there are no outside signs to mark the passing of time. The biological clock
tells plants when to form flowers and when the flowers should open. It tells
insects when to leave the protective cocoon and fly away. And it tells animals
when to eat, sleep and wake. It controls body temperature, the release of some
hormones and even dreams. These natural daily events are circadian
rhythms. Man has known about them for thousands of years. But the first scientific observation of circadian rhythms was not made until 1729. In that year a French astronomer, Jean Jacques d’Ortous de Mairan, noted that one of his plants opened its leaves at the same time every morning, and closed them at the same time every night. The plant did this even when he kept it in a dark place all the time. Later scientists wondered about circadian rhythms in humans. They learned that man’s biological clock actually keeps time with a day of a little less than 25 hours instead of the 24 hours on a man-made clock. About four years ago an American doctor, Eliot Weitzman, established a laboratory to study how our biological clock works. The people in his experiments are shut off from the outside world. They are free to listen to and live by their circadian rhythms. Dr. Weitzman hopes his research will lead to effective treatments for common sleep problems and sleep disorders caused by ageing and mental illness. The laboratory is in the Montefiore Hospital in New York City. It has two living areas with three small rooms in each. The windows are covered, so no sunlight or moonlight comes in. There are no radios or television receivers. There is a control room between the living areas. It contains computers, one-way cameras and other electronic devices for observing the person in the living area. A doctor or medical technician is on duty in the control room 24 hours a day during an experiment. They do not work the same time each day and are not permitted to wear watches, so the person in the experiment has no idea what time it is. In the first four years of research, Dr. Weitzman and his assistant have observed 16 men between the ages of 21 and 80. The men remained in the laboratory for as long as six months. Last month, a science reporter for “The New York Times” newspaper, Dava Sobel, became the first woman to take part in the experiment. She entered the laboratory on June 13th and stayed for 25 days. Miss Sobel wrote reports about the experiment during that time, which were published in the newspaper. |
A:every creature has an inner biological clock. B:the biological clock works day and night. C:the biological clock has circadian rhythms. D:the biological clock regulates behavior of creatures.
C
| On the morning of November 18,1735, an
earthquake shook Boston, Massachusetts. John Winthrop, a professor at Harvard
College, felt the quake and awoke. "I rose," Winthrop wrote, "and lighting a
candle, looked on my watch, and found it to be 15 minutes after four." John
Winthrop walked quickly downstairs to the grandfather’s clock. It had stopped
three minutes before, at 4 ’ 11. Except for stopping the clock, the quake had
only thrown a key from the mantel to the floor. The clock had stopped because Winthrop had put some long glass tubes he was using for an experiment into the box for safekeeping. The quake had knocked the tubes over and blocked the pendulum. Winthrop, therefore, had the exact time that the earthquake had hit Boston. He looked at the key on the floor. The quake had thrown it forward in the direction of the quake’s motion by a shock coming from the northwest, perhaps in Canada. |
A:John Winthrop had difficulty in sleeping B:earthquakes are common in Boston C:Boston was a center for clock-making D:John Winthrop was a scientist
C
| On the morning of November 18,1735, an
earthquake shook Boston, Massachusetts. John Winthrop, a professor at Harvard
College, felt the quake and awoke. "I rose," Winthrop wrote, "and lighting a
candle, looked on my watch, and found it to be 15 minutes after four." John
Winthrop walked quickly downstairs to the grandfather’s clock. It had stopped
three minutes before, at 4 ’ 11. Except for stopping the clock, the quake had
only thrown a key from the mantel to the floor. The clock had stopped because Winthrop had put some long glass tubes he was using for an experiment into the box for safekeeping. The quake had knocked the tubes over and blocked the pendulum. Winthrop, therefore, had the exact time that the earthquake had hit Boston. He looked at the key on the floor. The quake had thrown it forward in the direction of the quake’s motion by a shock coming from the northwest, perhaps in Canada. |
A:the earthquake was not severe (= violent, serious) B:the key of the clock was lost C:the clock was broken up D:the earthquake was Very serious
{{B}}第三篇{{/B}}
| ? ? ? ? ? ? ?
? ? ? ? ? ? ? ? ? ? {{B}}The
Body Clock{{/B}} ? ?Why is it that flying to New York from London will leave you feeling less tired than flying to London from New York? The answer may be a clear case of biology not being able to keep up with technology. ? ?Deep inside the brain there is a "clock" that governs every aspect of the body’s functioning: sleep and wake cycles, levels of alertness, performance, mood, hormone levels, digestion, body temperature and so on. It regulates all of these functions on a 24-hour basis and is called the biological clock. ? ?This body clock programmes us to be sleepy twice a day, between 3-5 am and again between 3-5 pm. Afternoon tea and nap are all cultural responses to our natural biological sleepiness in the afternoon. ? ?One of the major causes of the travellers’ malady known as jet lag is the non-alignment of a person’s internal body clock with clocks in the external world. Crossing different time zones confuses the biological clock, which then has to adjust to the new time and patterns of light and activity. To make matters more complex, not all internal body functions adjust at the same rate. So your sleep/wake may adjust to a new time zone at one rate, while your temperature adjusts at a different pace. Your digestion may be on a different schedule altogether. ? ?Though we live in a 24-hour day, the natural tendency of the body clock is to extend our day beyond 24 hours. It is contrary to our biological programming to "shrink" our day. ? ?That is why traveling in a westward direction is more body-clock friendly than flying east. NASA studies of long haul pilots showed that westward travel was associated with significantly better sleep quantity and quality than eastward flights. ? ?When flying west, you are "extending" your day, thus traveling in the natural direction of your internal clock. Flying eastward will involve "shrinking’" or reducing your day and is in direct opposition to your internal clock’s natural tendency. ? ?One of the more common complaints of travelers is that their sleep becomes disrupted. There are many reasons for this: changing time zones and schedules, changing light and activity levels, trying to sleep when your body clock is programmed to be awake, disruption of the internal biological clock and working longer hours. ? ?It is often suggested that you adjust your watch as soon as you board a plane, supposedly to try to help you adjust to your destination’s schedule as soon as you arrive. But it can take the body clock several days to several weeks to fully adjust to a new time zone. ? ?So, our body clock truly can "govern" us. |
A:you can control your own body clock. B:it is not difficult to adjust to a new time zone. C:adjusting your watch can help you avoid jet lag. D:there isn’t much you can do to avoid jet lag.
? ?下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。
{{B}}第一篇{{/B}}
| ? ?
第一篇 ? ? Accurate Timer ? ?These days time is everything. Between meetings and appointments, deadlines and conference calls, my schedule requires that I know the time down to the minute. Even on weekends, I have a football team to coach, shows to tape and planes to catch. If I’m late, I’m sunk. The problem is that it’s hard if my clocks aren’t correct. Even the digital clocks can display time inaccurately. Dead batteries, time changes, any of these can cause a clock to be inaccurate. Now there is no need to worry, because advanced radio technology has produced a clock which gets the time directly from the U.S. Atomic Clock in Fort Collins, Colorado, the standard for time-keeping all over the world. The Atomic Clock by Acorn is the most accurate, reliable and convenient timepiece you can have. ? ?Every morning at 1:00 a. m, this "smart" clock in Colorado automatically resets itself to the exact hour, minute and second. The U. S. Atomic Clock is accurate to ten billionths of a second per day. This means that the clock deviates less than one second over a one million-year period. The Atomic Clock even adjusts automatically for daylight saving time, so you don’t have to remember to "spring forward" or "fall back". The desktop clock model is the only atomic Clock that will not lose time with low power or when you change its batteries. ? ?The most accurate clock in the world is of no use if it is difficult to operate. The Acorn Atomic Clock is engineered in Germany using the latest scientific technology. It comes in two styles, the wall clock and the desktop model. Both are designed to be functional and easy to use. The desk clock’s display features the exact time (in hours, minutes and seconds), month and date, or you can choose to display any two U. S. or world time zones. It weighs only eight ounces, and is the perfect travel clock It also has dual alarms, perfect for couples. Both the desktop and the wall models have an internal antenna for good reception without unattractive wires. |
A:The importance of timing. B:The working principle of an ordinary clock. C:The features of the U.S. Atomic Clock. D:The manufacturer of the U.S. Atomic Clock.
? ?下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。
{{B}}第一篇{{/B}}
| ? ?
第一篇 ? ? Accurate Timer ? ?These days time is everything. Between meetings and appointments, deadlines and conference calls, my schedule requires that I know the time down to the minute. Even on weekends, I have a football team to coach, shows to tape and planes to catch. If I’m late, I’m sunk. The problem is that it’s hard if my clocks aren’t correct. Even the digital clocks can display time inaccurately. Dead batteries, time changes, any of these can cause a clock to be inaccurate. Now there is no need to worry, because advanced radio technology has produced a clock which gets the time directly from the U.S. Atomic Clock in Fort Collins, Colorado, the standard for time-keeping all over the world. The Atomic Clock by Acorn is the most accurate, reliable and convenient timepiece you can have. ? ?Every morning at 1:00 a. m, this "smart" clock in Colorado automatically resets itself to the exact hour, minute and second. The U. S. Atomic Clock is accurate to ten billionths of a second per day. This means that the clock deviates less than one second over a one million-year period. The Atomic Clock even adjusts automatically for daylight saving time, so you don’t have to remember to "spring forward" or "fall back". The desktop clock model is the only atomic Clock that will not lose time with low power or when you change its batteries. ? ?The most accurate clock in the world is of no use if it is difficult to operate. The Acorn Atomic Clock is engineered in Germany using the latest scientific technology. It comes in two styles, the wall clock and the desktop model. Both are designed to be functional and easy to use. The desk clock’s display features the exact time (in hours, minutes and seconds), month and date, or you can choose to display any two U. S. or world time zones. It weighs only eight ounces, and is the perfect travel clock It also has dual alarms, perfect for couples. Both the desktop and the wall models have an internal antenna for good reception without unattractive wires. |
A:It has dual alarms. B:It has an outside antenna. C:It is a perfect travel clock due to its light weight. D:It displays two time zones.
The ClockThat Wake Yozf When You Are Ready Are you a teal grump(脾气坏的人)in the mOITIings?Do you wake up every day feeling tired，angry aJld up8et，and all too ready to flit the Snooze(瞌睡)button?If so，then a new alarnl clock COilld be just for you．The c10ck，called S1eepSmart，measures your sleep cycle，and waits for you t0 be in your lightest phase of sleep before waking you up，Its makers say that should ensure you wake up feeling refreshed(恢复精力) every moiTling． As you sleep you paSS through a sequence of aleep states—light sleep，deep sleep and REM sleep(快速眼动睡眼)一that repeats approximately every 90 minutes．The points in that cycle at which you wakeear affect hOW you feellater，aJld may even have a greater impact th．衄hOW 10ng or little you have slept．Being wakened during a light phase means you are more 1ikely t0 wake up cheefful and full 0f life and interest． SleepSmart records the distinct pattern 0f bmin waves pmdueed during each phase of sleep，Via a head baJld equipped with electrodes(电极)and a mieroprocessor．This measures electric actiVity of the weare’s brain，and eommunicates wirelessly with a clock unit near the bed．You program the clock with the latest time at which vou Wallt t0 be wakened，and it then at the pIDper time wakes you during the 1ast light sleep phase before that． The concept was invented by a group 0f students at Brown Universl‘ty in Rhode Island after a friend complained 0f waking up tired and performing p00dy on a test“As sleep—depriVed(剥夺)people ourselves，we started thinking of what t0 do about it，’’says Eric Shashoua，a recent coUege graduate and now chief executive officer 0f Axon Sleep Research Laboratories，a company created by the students to develop their idea．They have almost finished a prototype and plan to market the product by next yeat" What should the 8leeper do to make the deVice work?
A:He should press the snooze button in time． B:He should tum 0n the micmpmcessor in the clock． C:He should set the 18test time for waking up． D:He should adjust his headband．
What is the meaning of "working round the clock"?
A:Repairing clocks. B:Making clocks. C:Working with a clock nearby. D:Working day and night.
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