Careful and careless are. [br] Many scientists are .A、either careful

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问题 Careful and careless are______. [br] Many scientists are ______.

选项 A、either careful or careless
B、neither careful nor careless
C、too careless to be careful
D、both careful and careless

答案 D

解析第一段说到，that is，they are both careful and careless。

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Careful and careless are______. [br] Many scientists are ______.A、either careful