单选题：It is difficult for him to make such a decision.

题目内容：

It is difficult for him to make such a decision. A．happy
B．hard
C．easy
D．simple

参考答案：

答案解析：

The book took ten years of thorough research.

The book took ten years of thorough research.A．basic B．careful C．social D．major

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The United States of America is among the top 10 countries.A．Right B．Wrong" C．No

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根据短文的内容，回答下列题目Outside-the-classroom Learning Makes a Big DifferencePutting a bun

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（　　）思维障碍对解决老问题并没有什么影响。(2010年5月真题)A．直线型 B．习惯型 C．权威型 D．自我中心型

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