2. 外语
  3. Careful and careless are______. Many scientists are ______.

Careful and careless are______. Many scientists are ______.

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问题 Careful and careless are______.
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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