31
[答案]:D
[解析]:参见教材P73
32
[答案]:C
[解析]:参见教材P73
33
[答案]:B
[解析]:参见教材P72
34
[答案]:B
[解析]:参见教材P71
35
[答案]:B
[解析]:参见教材P71
36
[答案]:A
[解析]:参见教材P71
37
[答案]:C
[解析]:参见教材P70
38
[答案]:D
[解析]:参见教材P69
39
[答案]:D
[解析]:参见教材P69
40
[答案]:C
[解析]:参见教材P65
41
[答案]:B
[解析]:参见教材P62
42
[答案]:D
[解析]:参见教材P62
43
[答案]:B
[解析]:参见教材P61
44
[答案]:B
[解析]:参见教材P61
45
[答案]:D
[解析]:参见教材P60
46
[答案]:A
[解析]:参见教材P59
47
[答案]:C
[解析]:参见教材P59
48
[答案]:B
[解析]:参见教材P81
49
[答案]:D
[解析]:参见教材P80
50
[答案]:B
[解析]:参见教材P79
51
[答案]:A
[解析]:参见教材P77
52
[答案]:D
[解析]:参见教材P77
53
[答案]:B
[解析]:参见教材P76
54
[答案]:C
[解析]:参见教材P76
55
[答案]:B
[解析]:参见教材P76
56
[答案]:B
[解析]:参见教材P75