1．【答案】A

2．【答案】D

3．【答案】A

4．【答案】A

5．【答案】C

6．【答案】A

7．【答案】D

8．【答案】B

9．【答案】C

10．【答案】A

11．【答案】A

12．【答案】B

13．【答案】B

14．【答案】A

15．【答案】C

16．【答案】A

17．【答案】C

18．【答案】D

19．【答案】C

20．【答案】C