Can you imagine that rats eat 40 to 50 times .A. by weightB. their weightC. in weightD. of

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A. by weight
(答案→)B. their weight
C. in weight
D. of their weight
解析：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。