据《中国经济周刊》报道，上海世博会第四轮环保活动投资总金额高

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问题选择题

据《中国经济周刊》报道，上海世博会第四轮环保活动投资总金额高达820亿元，其中820亿用科学记数法表示为（　　）

A．0.82×10¹¹

B．8.2×10¹⁰

C．8.2×10⁹

D．82×10⁸

答案

820亿=82 000 000 000=8.2×10¹⁰．故选B．

填空题

根据句意和首字母完成下列单词。

1. J______ is the first month of a year.

2. She is very t_______, and she wants to drink some water.

3. Twenty-three and seventeen is f_______.

4. S______ points down on the map.

5. Mr Cheng is a waiter. He works in a r_______.

6. The last day of a week is S_______.

7. There are t_______ months in a year.

8. It's raining outside. You should take an u_______ with you.

9. Red t _______ light is stop. Green is go.

10. September tenth is T_______ Day.

填空题

完成劳动定额时，是指（）的定额工时。