单项选择题

It can be inferred from the passage that the Sun's light travels ______.

A．through solid objects in space
B．in many different directions
C．further in summer than in winter
D．more slowly than scientists previously believed
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单项选择题
In the third sentence of the first paragraph the word deal could best be replaced by ______.
A．barter.
B．bargain.
C．are involved.
D．are concerned.
单项选择题
Which of the following is most clearly analogous (类似的) to the example of the person who fears dogs
A．A child chokes on a fishbone and as an adolescent he is reluctant to eat fish.
B．A person feels lonely and after a while he buys a dog for a companionship.
C．A child studies science in school and later grows up to become a teacher.
D．A person hears that a snowstorm is predicted and in that evening is afraid to drive home.
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