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【单选题】
Passage Two
Questions 29 to 31 are based on the passage you have just heard.
A.
To show that air travel is far safer than driving a car.
B.
To show the great responsibility shouldered by the pilots.
C.
To give an example of air disasters.
D.
To show the key role played by air traffic controllers.
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】按照传播途径，预防急性细菌性结膜炎应采取的措施是
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】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 ...
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 surface 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.
【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.