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问题 选择题

2008北京奥运会主会场“鸟巢”的座席数是91000个，这个数用科学记数法表示为[ ]

A．0.91×105

B．9.1×104

C．91×103

D．9.1×103

答案

答案：B

填空题

用所给动词的适当形式填空。

1. His father stopped ________ (work) because of his illness.

2. Mary often helps her moth _______ (do) the housework after school.

3. Project Hope _______ (train) many teachers so far.

4. He _______ (listen) to music when we called him that evening.

5. We _______ (learn) two thousand English words in the last four years.

6. My old grandfather has come here _______ (take) his bag back.

7. There is a group of children _______ (play) football on the playground.
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名词解释

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