选用括号内所给单词的适当形式填空。

1. Turn right on _____________ Avenue and the zoo is on your left. (nine)

2. Tom is _____________ on the beach now. He is very relaxed. (lie)

3. Mary's mother works ill a police station, she is a _____________. (police)

4. Please write to me and tell me about _____________ (you)

5. It's very warm today, it's a _____________ day. (sun)

通过抑制二氢叶酸还原酶，阻碍疟原虫核酸合成的药物是（）

A.氯喹

B.乙胺嘧啶

C.伯氨喹

D.青蒿素

E.奎宁