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问题 单项选择题

Word文档默认的扩展名是____ .

A．DOT

B．TXT

C．DOC

D．PPT

答案

参考答案：C

多项选择题

微粒在液体介质中的沉降将受其他因素的影响，这些因素包括（）

A.介质的浮力

B.介质的阻力

C.扩散现象

D.压力

E.空气的阻力
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改错题
下列每句的画线部分中有一处错误，找出并改正 。
(      )1. For many teenagers, Du Fei has a few habits that are not so good for him. 
              A                                        B                            C
(      )2. I would rather go out than to stay at home.
                      A                        B    C
(      )3. Exercising helps teenagers to stay health. 
                   A                                     B    C
(      )4. He finded it important to learn English well.
                      A    B                  C
(      )5. His teachers want him change his attitude. 
                                   A           B              C		_________

_________               

_________

_________

_________
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