农村低压线损管理工作要求专职电工每月应对辖区内（）进行一次例行用电检查。
A.低压线路
B.树障
C.台区
D.客户
参考答案：A, D
用所给动词的适当形式填空。
1. He can _____________ (catch) the ball.
2. They usually _____________ (teach) each other.
3. Jenny often _____________ (buy) some things at the store.
4. We _____________ (go) to a little store this morning.
5. You _____________ (have) fun today.
6. He _____________ (be) a good basketball player.
2010年我县举行“菜花节”共接待游客约520 000人，请将数字520 000用科学记数法表示为：______．
