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问题 单项选择题

以下关于粗苯各组成成分中的含量描述错误的是( )。

A．苯(40%～50%)
B．甲苯(12%～22%)
C．二甲苯(2%～6%)
D．三甲苯(1%～2%)

答案

参考答案：A

单项选择题

河流泥沙测验一般涉及野外作业、（）和数据记载计算及资料整理分析几个环节。

A、制订计划

B、内业工作

C、总结研究

D、实验室业务
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单项选择题

If we take a close look at successful language learners, we may discover a few techniques (技巧) which makes language learning easier for them.
(16) , successful language learners are independent learners. They do not depend on (依赖) books or teachers; they (17) their own way to learn the language. They try to find the patterns and the rules for themselves, (18) waiting for the teacher to explain everything. They are good guessers who look for clues to form their (19) conclusions which are very different from others’.
Successful language learning is (20) learning. Therefore, successful learners do not wait for a chance to use the language; they (21) such a chance. They find people who speak the language and ask these people to correct them (22) they make mistakes. They will try anything to communicate. When communication is difficult, they can (23) information that is incomplete (不完整的). It is more important for them to learn to (24) in the language than to know the meaning of every word.
Finally, successful language learners are learners with a (25) in order to communicate with these people and learn from them. They want to learn a language because they are interested in the language and the people who speak it. It is necessary for them to learn the language.

Ⅱ. 完形填空

/Close
阅读下面短文，从短文后所给各题的四个选项(A、B、C和D)中选出一个最佳选项。

A．ideal

B．informal

C．early

D．active
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