单项选择题

The ability to react to environmental stimuli is a basic and general characteristic of living organisms.

A．reject
B．repeat
C．return to
D．respond to
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单项选择题
The Pullman Strike of 1894 tied up transportation and was finally ended only by government intervention.
A．relied upon
B．hindered
C．linked with
D．imitated
单项选择题
Although a herd of African elephants may have up to one thousand members, Asiatic elephants live in bands of five to sixty animals.
A．as many as
B．more than
C．fewer than
D．at least
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