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2018年江苏省高考英语二轮专用题型组合练（4）含解析
2．For different species of mammals，brain size varies widely in that________．
A．mammals can develop different adaptive abilities
B．a larger brain has its advantages and disadvantages
C．different mammals are born with different lifespans
D．brain size is affected by genetic or nongenetic factors
B [细节理解题。根据第三段中的“Across species of mammals，brain size varies widely.This is thought to be a consequence of specific differences in the benefits and costs of a larger brain”可知，动物脑的大小有差异的原因是较大的脑有其优缺点。]
