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.
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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.
单项选择题
The passage indicates that, in comparison to radio waves, gamma waves ______.
A．are not as long
B．produce louder sound
C．are less magnetic
D．do not form in the Sun's center
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