单项选择题

A．Scientists have studied them for centuries.
B．They were meat eating as well as plant eating.
C．They wandered the earth for millions of years.
D．They lived on land, in the sea, and in the sky.
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单项选择题
Mintel undertakes market surveys on an annual basis.
A．Y
B．N
C．NG
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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