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单项选择题

A．At 9:00.
B．At 9:30.
C．At 9:25.
D．At 10:00.
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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

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.