（）是承运人的基本义务之一。
A.收取运输费用
B.确保旅客运输安全正点
C.爱护铁路设备
D.遵守铁路运输规章制度
参考答案：B
以下哪个不是5-羟色胺（5-HT）重摄取抑制剂类抗抑郁药（）
A.拉莫三嗪
B.文拉法辛
C.氟西汀
D.帕罗西汀
E.舍曲林
用括号内所给单词的适当形式填空。
1. As a driver, you should concentrate on______(drive).
2. Linda volunteered______ (help) me with my English.
3. Making friends with foreigners is a good way ______ (practice) English.
4. Shanghai is one of ______ (big) cities in the world.
5. By July last year, he______ (work) here for ten years.
