单项选择题


A．essential
B．available
C．reliable
D．dependent
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单项选择题
A．acquisitionB．appreciationC．requirementD．alternative
A．acquisition
B．appreciation
C．requirement
D．alternative
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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