31
[答案]:A
[解析]:参见教材P163
32
[答案]:B
[解析]:参见教材P162
33
[答案]:C
[解析]:参见教材P177
34
[答案]:B
[解析]:参见教材P160
35
[答案]:A
[解析]:参见教材P185
36
[答案]:A
[解析]:参见教材P164
37
[答案]:D
[解析]:参见教材P152
38
[答案]:C
[解析]:参见教材P161
39
[答案]:B
[解析]:参见教材P155
40
[答案]:A
[解析]:参见教材P154
41
[答案]:C
[解析]:参见教材P154
42
[答案]:B
[解析]:参见教材P180
43
[答案]:B
[解析]:参见教材P175
44
[答案]:D
[解析]:参见教材P175
45
[答案]:C
[解析]:参见教材P165