1．【答案】A

2．【答案】B

3．【答案】A

4．【答案】C

5．【答案】A

6．【答案】C

7．【答案】A

8．【答案】C

9．【答案】D

10．【答案】D

11．【答案】B

12．【答案】D

13．【答案】C

14．【答案】B

15．【答案】C

16．【答案】B

17．【答案】D

18．【答案】C

19．【答案】C

20．【答案】B