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Can you imagine that rats eat 40 to 50 times _______.
A.by weightB.their weightC.in weightD.of their weight
B
考查倍数表达法:倍数+名词(their weight),句意:你能想象老鼠吃的是体重的40-50倍吗?选B。A是按重量算,C是重量上,D是他们的重量。
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