单项选择题

A．Two blocks.
B．Five blocks.
C．Three blocks.
D．Four blocks.
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单项选择题
By upsetting the balance of the climax stage, man will encourage the indiscriminate hunting of whales for food.
A．Y
B．N
C．NG
单项选择题
If man continues to interfere with the balance of nature, it is possible that man may soon become extinct.
A．Y
B．N
C．NG
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