41
[答案]:B
[解析]:参见教材P280
42
[答案]:B
[解析]:参见教材P281
43
[答案]:C
[解析]:参见教材P281
44
[答案]:B
[解析]:参见教材P281
45
[答案]:B
[解析]:参见教材P287
46
[答案]:C
[解析]:参见教材P287
47
[答案]:A
[解析]:参见教材P287
48
[答案]:B
[解析]:参见教材P287
49
[答案]:B
[解析]:参见教材P287
50
[答案]:A
[解析]:参见教材P287
51
[答案]:B
[解析]:参见教材P290
52
[答案]:B
[解析]:参见教材P291
53
[答案]:A
[解析]:参见教材P291
54
[答案]:C
[解析]:参见教材P291
55
[答案]:B
[解析]:参见教材P292
56
[答案]:C
[解析]:参见教材P289