某农产品的供给函数为Q＝10+2P，式中：Q为供给量，单位为千克；P为价格，单位为元。据此回答下列问题。

该农产品的供给价格弹性E＝( )。

A:ΔQ／Q÷ΔP／P B:ΔQ／QxΔP／P C:ΔQ／ΔP÷P／Q D:Q／P÷ΔQ／ΔP

两样本均数比较的t检验中，结果为P<0.05，有统计意义

P愈小则

A:说明两样本均数差别愈大 B:说明两总体均数差别愈大 C:说明样本均数与总体均数差别愈大 D:愈有理由认为两样本均数不同 E:愈有理由认为两总体均数不同

 Chicken Soup for the Soul：Comfort Food Fights Loneliness

Mashed potatoes, macaroni and cheese, may be bad for your arteries．    1    according to a study in Psychological Science, they’re good for your heart and    2    ．The study focuses on “comfort food¹” and how it makes people feel．

"For me   3  ,food has always played a big role in my family,” says Jordan Troisi, a graduate student² at the University of Buffalo³, and lead author⁴ on the study．The study came out of the research program of his co—author Shira Gabriel．It has    4    non-human things that may affect human emotions．Some people reduce loneliness by bonding with their    5    TV show, building virtual relationships with a pop song singer or looking at pictures of loved ones．Troisi and Gabriel wondered if comfort food could have the same effect    6    making people

think of their nearest and dearest⁵.

In one experiment, in order to make   7   feel lonely, the researchers had them write for six minutes about a fight with someone close to them．Others were given an emotionally neutral writing assignment. Then, some people in each   8    wrote about the experience of eating a comfort food and others wrote about eating a new food．  9    ,the researchers had participants    10    questions about their levels of loneliness⁶．

Writing about a fight with a close person made people feel lonely．But people who were generally   11    in their relationships would feel less lonely by writing about a comfort food．"We have found that comfort foods are consistently associated with those close to us．"says Troisi．"Thinking about or consuming these foods later then serves as a reminder of those close others．"In   12   essays on comfort food, many people wrote about the    13    of eating food with family and friends.

In another experiment,    14    chicken soup in the lab made people think more about relationships, but only if⁷ they considered chicken soup to be a comfort food．This was a question they had been asked long before the experiment, along with many other questions, so they wouldn’t remember it.

Throughout everyone’s daily lives⁸ they experience stress, often associated with our  15   with others," Troisi says．"Comfort food Can be an easy remedy for loneliness． 

词汇：

mashed /mæʃt/ adj．被捣成糊浆的

macaroni/ macaroni/ n．通心粉

cheese / tʃi:z / n．奶酪

artery/ artery / n．动脉

assignment / ə"sainmənt / n．指定作业

reminder / reminder/ n．起提醒作用的东西

remedy /remedy/ n．治疗方法，药物

virtual/"və:tʃuəl/ adj．虚拟的

注释：

1.comfort food：爽心食品

2. graduate student：研究生

3. The University of Buffalo：布法罗大学，建校于1846 年，位于水牛城（ Buffalo City) ，属于纽约州立大学，因此称为纽约州立大学水牛城分校。

4. lead author：首席作者

5. their nearest and dearest：他们最接近和最亲爱的人

6. levels of loneliness：孤独程度

7. only if: 只有（在……情况下）

8. Throughout everyone"s daily lives：在每一个人的日常生活中。through 有“贯穿”的意思。

空4

A:looked for B:looked at C:looked after  D:looked up

An Intelligent Car

Driving needs sharp eyes, keen ears, quick brain, and coordination between hands and the brain. Many human drivers have all    1   and can control a fast-moving car. But how does an intelligent car control itself?

There is a virtual driver¹ in the smart car. This virtual driver¹ has “eyes,” “brains,” “hands” and “feet,” too. The minicameras    2   each side of the car are his “eyes,” which observe the road conditions ahead of it. They watch the    3   to the car’s left and right. There is also a highly

   4   driving system in the car. It is the built-in computer, which is the virtual driver’s “brain.” His “brain” calculates the speeds of    5    moving cars near it and analyzes their positions. Basing on this information², it chooses the right    6   for the intelligent car, and gives   7  to the “hands” and “feet” to act accordingly. In this way, the virtual driver controls his car.

What is the virtual driver’s best advantage³? He reacts  8  .The minicameras are  9  images continuously to the “brain.” It   10  the processing of the images within 100 milliseconds. However, the world’s best driver   11   needs one second to react.   12   , when he takes action, he needs one more second.

The virtual driver is really wonderful. He can reduce the accident    13   considerably on expressways. In this case, can we let him have the wheel⁴ at any time and in any place? Experts      14  that we cannot do that⁵ just yet⁶. His ability to recognize things is still    15   . He can now only drive an intelligent car on expressways.

词汇：

coordination / kəʊˌɔ:dnˈeɪʃən / n．协调，协同
virtual / ˈvɜ:tʃuəl / adj．虚拟的
minicamera n．微型相机
accordingly / əˈkɔ:dɪŋli / adv．相应地
millisecond / ˌmɪlɪˈsɛkənd / n．毫秒
expressway / ɪkˈspresweɪ / n．高速公路

注释：

1. virtual driver：虚拟驾驶员

2. Basing on this information：基于这些信息。 Basing on this information是现在分词短语，用作状语。

3. best advantage：昀大的优点

4. have the wheel：掌握方向盘，也就是“驾驶汽车”的意思。

5. that：that替代上一句的“ let him have the wheel at any time and in any place”。

6. just yet：迄今还。 yet意为“迄今还”，常用于否定句中。 Just修饰 yet，起强调的作用。

空12

A:So B:However C:Besides D:Therefore

Power Napping is Good for the I.Q.

    Today we hear more and more about the importance of getting enough sleep—about eight hours a night. Sleep can help heal and give energy to both the body and the brain. ____1____ It seems almost certain that the third of our lives that we spend asleep has a great effect on the two-thirds that we are awake. Sleep affects our emotions, memory, focus, and behavior.

    Studies show that people in developed countries spend less time asleep and more time at work or commuting. Dr. Karine Spiegel, at the UniversityofChicago, has found that the average length of sleep has gone down from nine hours a night in 1910 to seven-and-a-half hours a night today. However, our bodies cannot function well without enough sleep. ____2____ According to Canadian scientist Dr. Stanley Coren, every hour of lost sleep at night causes us to lose one I.Q. point the next day. For example, when someone gets only five or six hours of sleep each night for a week, the person’s I.Q. could go down 15 points or more. ____3____

    Most sleep experts say that humans need at least eight hours of sleep every day, but it should be in two stages: a long sleep at night and a shorter nap in the afternoon. Some companies help their employees follow this advice. ____4____ They say this makes the workers much more efficient.

    To study sleep deprivation (not getting enough sleep), scientists use a test called the Multiple Sleep Latency Test (MSLT). During the test, a person stays in a darkened, quiet room during the daytime. Scientists believe that a sleep-deprived person will fall asleep quickly. If it takes ten minutes or longer to fall asleep, the person is probably getting enough sleep.

    Scientists have also found that the time of year seems to affect how much sleep we need. ____5____ However, in the summer, people sometimes sleep as little as six hours, without having any problems.

词汇：

emotion [bɪ"ri:vmənt] n. 情绪

commuting [kə"mju:t] n. 乘公交车上下班，通勤

I.Q. n. 智商（全称为intelligent quotient）

deprivation [kə"mju:t] n. 剥夺，匮乏

Sleep Latency Test n. 睡眠潜伏期

注释：

1．have/has an effect on... 对……有效果的

2．go down from... to...从………降至……

练习：

A　They allow them to “power nap” in the afternoon, if only for 20 minutes.

B　Losing just one or two hours of sleep a night, over a long period of time, can cause serious health problems.

C　People usually sleep longer in the winter, sometimes as much as 14 hours a night.

D　People in power are more intelligent because they take naps.

E　Medical experts now believe that sleep is even more important for health than diet or exercise.

空3

A:A B:B C:C D:D E:E F:F

Are Online Friends Real Friends?

    Modern computer technology has made a new kind of human relationship possible: online friendship. ____1____. Are online friendships as beneficial as face-to-face friendships? What are the advantages and disadvantages of having virtual friends? Can people form strong bonds online? Today these questions are the subject of lively debate¹.