A:Not interrupting others. B:Enjoy listening to the entire thought of someone. C:Waiting impatiently for your chance to respond. D:Slowing down your responses.
Although many factors affect human health during periods in space, weightlessness is the dominant and single most important one. The direct and indirect effects of weightlessness lead to a series of related responses. Ultimately, the whole body, from bones to brain, kidneys to bowels, reacts.
When space travelers grasp the wall of their spacecraft and jerk their bodies back and forth, they say it feels as though they are stationary and the spacecraft is moving. The reason is based in our reliance on gravity to perceive our surroundings.
The continuous and universal nature of gravity removes it from our daily notice, but our bodies never forget. Whether we realize it or not, we have evolved a large number of silent, automatic reactions to cope with the constant stress of living in a downward-pulling world. Only when we decrease or increase the effective force of gravity on our bodies do our minds perceive it.
Our senses provide accurate information about the location of our center of mass and the relative positions of our body parts. Our brains integrate signals from our eyes and ears with other information from the organs in our inner ear, from our muscles and joints, and from our senses of touch and pressure.
The apparatus of the inner ear is partitioned into two distinct components: circular, fluid-filled tubes that sense the angle of the head, and two bags filled with calcium crystals embedded in a thick fluid, which respond to linear movement. The movement of the calcium crystals sends a signal to the brain to tell us the direction of gravity. This is not the only cue the brain receives. Nerves in the muscles, joints, and skin—particularly the slain on the bottom of the feet—respond to the weight of limb segments and other body parts.
Removing gravity transforms these signals. The inner ear no longer perceives a downward tendency when the head moves. The limbs no longer have weight, so muscles are no longer required to contract and relax in the usual way to maintain posture and bring about movement. Nerves that respond to touch and pressure in the feet and ankles no longer signal the direction of down. These and other changes contribute to orientation illusions, such as a feeling that the body or the spacecraft spontaneously changes direction. In 1961 a Russian astronaut reported vivid sensations of being upside down; one space shuttle specialist in astronomy said, "When the main engines cut off, I immediately felt as though we had inverted 180 degrees." Such illusions can recur even after some time in space.
The function of apparatus of the inner ear is ______.
A:to partition into two distinct components B:to respond to linear movement C:to send a signal to the brain to tell us the direction of gravity D:to respond to the weight of limb segments and other body parts
Although many factors affect human health during periods in space, weightlessness is the dominant and single most important one. The direct and indirect effects of weightlessness lead to a series of related responses. Ultimately, the whole body, from bones to brain, kidneys to bowels, reacts.
When space travelers grasp the wall of their spacecraft and jerk their bodies back and forth, they say it feels as though they are stationary and the spacecraft is moving. The reason is based in our reliance on gravity to perceive our surroundings.
The continuous and universal nature of gravity removes it from our daily notice, but our bodies never forget. Whether we realize it or not, we have evolved a large number of silent, automatic reactions to cope with the constant stress of living in a downward-pulling world. Only when we decrease or increase the effective force of gravity on our bodies do our minds perceive it.
Our senses provide accurate information about the location of our center of mass and the relative positions of our body parts. Our brains integrate signals from our eyes and ears with other information from the organs in our inner ear, from our muscles and joints, and from our senses of touch and pressure.
The apparatus of the inner ear is partitioned into two distinct components: circular, fluid-filled tubes that sense the angle of the head, and two bags filled with calcium crystals embedded in a thick fluid, which respond to linear movement. The movement of the calcium crystals sends a signal to the brain to tell us the direction of gravity. This is not the only cue the brain receives. Nerves in the muscles, joints, and skin—particularly the slain on the bottom of the feet—respond to the weight of limb segments and other body parts.
Removing gravity transforms these signals. The inner ear no longer perceives a downward tendency when the head moves. The limbs no longer have weight, so muscles are no longer required to contract and relax in the usual way to maintain posture and bring about movement. Nerves that respond to touch and pressure in the feet and ankles no longer signal the direction of down. These and other changes contribute to orientation illusions, such as a feeling that the body or the spacecraft spontaneously changes direction. In 1961 a Russian astronaut reported vivid sensations of being upside down; one space shuttle specialist in astronomy said, "When the main engines cut off, I immediately felt as though we had inverted 180 degrees." Such illusions can recur even after some time in space.
A:to partition into two distinct components B:to respond to linear movement C:to send a signal to the brain to tell us the direction of gravity D:to respond to the weight of limb segments and other body parts
Why are two shots thought to be necessary People born after 1957 have not been exposed to a similar virus. The first dose "primes" (使准备好) the immune system to respond, but it’s the second shot that triggers the production of antibodies. This is not unusual. A number of vaccines are given for the first time in multidose series. For example, the seasonal flu vaccine is given in two shots to children under 9 if they’ve never had the flu.
What is the function of the first shot of the vaccine
A:To get the body ready for the second shot. B:To trigger the production of antibodies. C:To get the immune system ready to respond. D:To avoid unusual side effects of the vaccine.
Why are two shots thought to be necessary People born after 1957 have not been exposed to a similar virus. The first dose "primes" (使准备好) the immune system to respond, but it’s the second shot that triggers the production of antibodies. This is not unusual. A number of vaccines are given for the first time in multidose series. For example, the seasonal flu vaccine is given in two shots to children under 9 if they’ve never had the flu.
What is the function of the first shot of the vaccine
A:To get the body ready for the second shot. B:To trigger the production of antibodies. C:To get the immune system ready to respond. D:To avoid unusual side effects of the vaccin
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Sending E-mails to Professors ? ?One student skipped class and then sent the professor an E-mail{{U}} ?(51) ?{{/U}}for copies of her teaching notes. Another{{U}} ?(52) ?{{/U}}that she was late for a Monday class because she was recovering from drinking too much at a wild weekend party. At colleges and universities in the US, E-mail has made professors more approachable (平易近人). But many say it has made them too accessible,{{U}} ?(53) ?{{/U}} boundaries that traditionally kept students at a healthy distance. ? ?These days, professors say, students seem to view them as available{{U}} ?(54) ?{{/U}}the clock, sending a steady stream of informal E-mails. ? ?"The tone that they take in E-mails is pretty astounding (令人吃惊的)," said Michael Kessler, an assistant dean at Georgetown University. "They’ll{{U}} ?(55) ?{{/U}}you to help: ’I need to know this.’" ? ?"There’s a fine{{U}} ?(56) ?{{/U}}between meeting their needs and at the same time maintaining a level of legitimacy (正统性) as an{{U}} ?(57) ?{{/U}}who is in charge." ? ?Christopher Dede, a professor at the Harvard Graduate School of Education, said{{U}} ?(58) ?{{/U}} show that students no longer defer to (听从) their professors, perhaps because they realize that professors’ {{U}}?(59) ?{{/U}}could rapidly become outdated. ? ?"The deference was driven by the{{U}} ?(60) ?{{/U}}that professors were all-knowing sources of deep knowledge," Dede said, and that notion has{{U}} ?(61) ?{{/U}}. ? ?For junior faculty members, E-mails bring new tension into their work, some say, as they struggle with how to{{U}} ?(62) ?{{/U}}. Their job prospects, they realize, may rest in part on student evaluations of their accessibility. ? ?College students say E-mail makes{{U}} ?(63) ?{{/U}}easier to ask questions and helps them learn. ? ?But they seem unaware that what they write in E-mails could have negative effects{{U}} ?(64) ? {{/U}}them, said Alexandra Lahav, an associate professor of Law at the University of Connecticut. She recalled an E-mail message from a student saying that he planned to miss class so he could play with his son. Professor Lahav did not respond. ? ?"Such E-mails can have consequences," she said. "Students don’t understand that{{U}} ?(65) ?{{/U}} they say in E-mail can make them seem unprofessional ?and could result in a bad recommendation." |
A:ask B:question C:respond D:request
Sending E-mails to Professors One student skipped class and then sent the professor an e-mail(51)for copies of her teaching notes. Another(52)that she was late for a Monday class because she was recovering from drinking too much at a wild weekend party. At colleges and universities in the US, e-mail has made professors more approachable(平易近人).But many say it has made them too accessible,(53)boundaries that traditionally kept students at a healthy distance. These days, professors say, students seem to view them as available(54)the clock, sending a steady stream of informal e-mails. “The tone that they take in e-mails is pretty astounding(令人吃惊的),”said Michael Kessler, an assistant dean at Georgetown University.” They’ll(55)you to help:’ I need to know this.’” “There’s a fine(56)between meeting their needs and at the same time maintaining a level of legitimacy(正统性)as an (57)who is in charge.” Christopher Dede, a professor at the Harvard Graduate School of Education, said(58)show that students no longer defer to(听从)their professors, perhaps because they realize that professors’ (59)could rapidly become outdated. “The deference was driven by the (60)that professors were all-knowing sources of deep knowledge,” Dede said, and that notion has(61). For junior faculty members, e-mails bring new tension into their work, some say, as they struggle with how to(62).Their job prospects, they realize, may rest in part on student evaluations of their accessibility. College students say e-mail makes(63)easier to ask questions and helps them learn. But they seem unaware that what they write in e-mails could have negative effects(64)them, said Alexandra Lahav, and associate professor of Law at the University of Connecticut. She recalled an e-mail message from a student saying that he planned to miss class so he could play with his son. Professor Lana did not respond. “Such e-mails can have consequences,” she said.” Students don’t understand that (65)they say in e-mail can make them seem unprofessional, and could result in a bad recommendation.”
A:ask B:question C:respond D:request
下面的短文有15处空白,请根据短文内容为每处空白确定1个最佳选项。
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Sending E-mails to Professors ? ?One student skipped class and then sent the professor an e-mail {{U}}?(51) ?{{/U}} for copies of her teaching notes. ? ?Another {{U}}?(52) ?{{/U}} that she was late for a Monday class because she was recovering from drinking too much at a wild weekend party. ? ?At colleges and universities in the US, e-mail has made professors more approachable(平易近人 ). But many say it has made them too accessible, {{U}}?(53) ?{{/U}} boundaries that traditionally kept students at a healthy distance. ? ?These days, professors say, students seem to view them as available {{U}}?(54) ?{{/U}} the clock, sending a steady stream of informal e-mails. ? ?"The tone that they take in e-mails is pretty astounding(令人吃惊的)." said Michael Kessler, an assistant dean at Georgetown University. "They’ll {{U}}?(55) ?{{/U}} you to help: ’I need to know this. ’" ? ?"There’s a fine {{U}}?(56) ?{{/U}} between meeting their needs and at the same time maintaining a level of legitimacy (正统性) as an {{U}}?(57) ?{{/U}} who is in charge. " ? ?Christopher Dede, a professor at the Harvard Graduate School of Education, said {{U}}?(58) ?{{/U}} show that students no longer defer to (听从) their professors, perhaps because they realize that professors’ {{U}}?(59) ?{{/U}} could rapidly become outdated. ? ?"The deference was driven by the notion {{U}}?(60) ?{{/U}} that professors were all-knowing sources of deep knowledge. " Dede said, and that notion has weakened {{U}}?(61) ?{{/U}}. ? ?For junior faculty members, e-mails bring new tension into their work, some say, as they struggle with how to {{U}}?(62) ?{{/U}}. Their job prospects, they realize, may rest in part on student evaluations of their accessibility. ? ?College students say e-mail makes {{U}}?(63) ?{{/U}} easier to ask questions and helps them learn. ? ?But they seem unaware that what they write in e-mails could have negative effects on {{U}}?(64) ?{{/U}} them, said Alexandra Lahav, and associate professor of Law at the University of Connecticut. ? ?She recalled an e-mail message from a student saying that he planned to miss class so he could play with his son. Professor Lahav did not respond. ? ?"Such e-mails can have consequences. " she said. "Students don’t understand that {{U}}?(65) ?{{/U}} they say in e-mail can make them seem unprofessional, and could result in a bad recommendation. " |
A:ask B:question C:respond D:request
A:Not interrupting others. B:Enjoy listening to the entire thought of someone. C:Waiting impatiently for your chance to respond. D:Slowing down your responses.
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