单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Traveling a lot.
B．Getting a lot of exercise.
C．Working too hard.
D．Waiting for the train.
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单项选择题
What effect does excessive positive onisation have on some people
A．They think they are mad.
B．They feel very tired.
C．They become violently sick.
D．They are too tired to do anything.
单项选择题
By observing the behavior of animals, scientists may be able to ______.
A．prevent disasters
B．organize groups of people
C．predict earthquakes
D．control areas of California
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