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【单选题】
Which of the following is true of Livingston （）
A．He thinks he has discovered a new possibility in the link between sun spots and the weather on the Earth.
B．He has great doubts about the theory that the sun’s frequent changes have an influence on the Earth’s climate.
C．He has been recently informed by other scientists of the possibility that more sun spots will appear.
D．He does not think the causes of the sun spots will be fully revealed by scientists in the near futur
A.
It seems to shine unchangingly, pouring out a constant light year after year. But the sun may not be nearly so stable as we suppose, It is now thought to move quickly and irregularly and change in long-term cycles, growing dimmer and then brighter with each passing year. Some even fear that its frequent changing behavior would have a great influence on the Earth’s climate.
B.
The source of the sun’s inconstancy is magnetism. Professor William Livingston has developed new theories about its magnetic nature.
C.
"We don’t yet know what causes sun spots, "he says, "but we now think they’re areas of high-level magnetism that come up from the sun’s interior. So strong is their magnetic pull that the highly ionized gas nearby is not able to transmit energy out." As a result these areas send out less heat and light and thus appear from Earth to be almost dark irregular suce patches.
D.
Sun spot activity generally fluctuates in steady, 11-year cycled. Scientists have long formed the opinion that as the size and number of sun spots increased, the overall energy sent out by the sun would decrease. Indeed, recent studies confirmed it, revealing that during peak periods of sun spot activity, the Earth experiences a small drop that can be seen clearly in received solar energy.
E.
Could such a small drop in energy have an effect here on earth Perhaps some scientists think the world temperature could fall by as much as 0.2 during periods of high solar magnetism... enough to cause significant fluctuations in weather patterns.
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参考答案：
举一反三
【单选题】Focus on what you do best. This age-old strategy has worked well for RealNetworks, Microsoft’s main competitor in multimedia software for the Internet. Now, the smaller Seattle-based firm is trying a ...
A.
Publishing the source code.
B.
Using RealNetworks’ achievements.
C.
Protecting intellectual property.
D.
Accusing of Microsoft.
【单选题】按照传播途径，预防流行性出血热应采取的措施是
A.
空气消毒
B.
饮水、食品、用品消毒
C.
日常生活用品消毒
D.
多途径消毒，杀虫，灭鼠
E.
治理污水，防蚊、灭蚊
【单选题】Questions 22 to 25 are based on the conversation you have just heard.
A.
When they’re unable to control the person’s behavior.
B.
When the causes of the behavior are obvious.
C.
When the consequences of the behavior are unpleasant.
D.
When the behavior is expected.
【单选题】某地盛产青皮甘蔗，每年冬季甘蔗成熟后，随着吃甘蔗人数的增加，儿童发生咳嗽、哮喘伴发热、皮疹等症状的人数也同步增加，一般于10天左右自愈。 导致误食感染是由于
A.
甘蔗未削洗干净就吃
B.
甘蔗太新鲜，应该存放10天左右
C.
儿童吃易感染，不能吃。成人吃不会发生
D.
吃了甘蔗露出地面的几节
E.
以上都不是
相关题目：
【单选题】Focus on what you do best. This age-old strategy has worked well for RealNetworks, Microsoft’s main competitor in multimedia software for the Internet. Now, the smaller Seattle-based firm is trying a ...
A.
Publishing the source code.
B.
Using RealNetworks’ achievements.
C.
Protecting intellectual property.
D.
Accusing of Microsoft.
【单选题】按照传播途径，预防流行性出血热应采取的措施是
A.
空气消毒
B.
饮水、食品、用品消毒
C.
日常生活用品消毒
D.
多途径消毒，杀虫，灭鼠
E.
治理污水，防蚊、灭蚊
【单选题】Questions 22 to 25 are based on the conversation you have just heard.
A.
When they’re unable to control the person’s behavior.
B.
When the causes of the behavior are obvious.
C.
When the consequences of the behavior are unpleasant.
D.
When the behavior is expected.
【单选题】某地盛产青皮甘蔗，每年冬季甘蔗成熟后，随着吃甘蔗人数的增加，儿童发生咳嗽、哮喘伴发热、皮疹等症状的人数也同步增加，一般于10天左右自愈。 导致误食感染是由于
A.
甘蔗未削洗干净就吃
B.
甘蔗太新鲜，应该存放10天左右
C.
儿童吃易感染，不能吃。成人吃不会发生
D.
吃了甘蔗露出地面的几节
E.
以上都不是
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