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问题 选择题

将函数y=2x+4的图象向下平移2个单位，所得的函数解析式为（　　）

A．y=2x+6

B．y=2x+2

C．y=2x

D．y=2x-2

答案

将函数y=2x+4的图象向下平移2个单位，所得的函数解析式为y=2x+4-2=2x+2，

故选：B．

填空题

根据句子意思，用括号中所给的单词适当形式填空。

1. Why not               (invite) your good friend, Tom?

2. Mr. Wu is our English teacher. He teaches               (we) English.

3. He is planning to leave for Beijing on the               (nine) day of the month.

4. They                (hold) a party for the exchange students from Great Britain.

5. Teddy smiles                (happy) when he sees his mother come back from work.

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单项选择题

（）不是摩托车挂档困难的原因。

A.离合器分离不彻底

B.发动机怠速过低

C.变速换档时操作动作不协调

D.变速鼓导销槽过度磨损
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