The scientific research on how to protect the rare animals is ________. Many sci

题干

The scientific research on how to protect the rare animals is ________. Many scientists are working hard to find new way to raise the animals by man.

A．in danger

B．in control

C．in order

D．in progress

上一题下一题 0.64难度单项选择更新时间:2012-10-09 02:32:10

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