1．【答案】B

2．【答案】C

3．【答案】B

4．【答案】A

5．【答案】D

6．【答案】A

7．【答案】C

8．【答案】B

9．【答案】B

10．【答案】C

11．【答案】D

12．【答案】D

13．【答案】C

14．【答案】C

15．【答案】D

16．【答案】D

17．【答案】C

18．【答案】A

19．【答案】C

20．【答案】C

21．【答案】C

22．【答案】A

23．【答案】B

24．【答案】B

25．【答案】C

26．【答案】C

27．【答案】C

28．【答案】A

29．【答案】B

30．【答案】B

31．【答案】A