7
[答案]:ABC
[解析]:参见教材P276
8
[答案]:ABCD
[解析]:参见教材P276
9
[答案]:ABD
[解析]:参见教材P277
10
[答案]:ABCD
[解析]:参见教材P278
11
[答案]:ABCD
[解析]:参见教材P278
12
[答案]:CD
[解析]:参见教材P278
13
[答案]:ABC
[解析]:参见教材P279
14
[答案]:AB
[解析]:参见教材P280
15
[答案]:AD
[解析]:参见教材P281
16
[答案]:ABCD
[解析]:参见教材P282
17
[答案]:AB
[解析]:参见教材P276
18
[答案]:ABCD
[解析]:参见教材P274-275
19
[答案]:ABCD
[解析]:参见教材P272
20
[答案]:ABC
[解析]:参见教材P273
21
[答案]:CD
[解析]:参见教材P273-274
22
[答案]:ABD
[解析]:参见教材P275
23
[答案]:BCD
[解析]:参见教材P275
24
[答案]:AC
[解析]:参见教材P277
25
[答案]:BC
[解析]:参见教材P277
26
[答案]:BCD
[解析]:参见教材P280
27
[答案]:BCD
[解析]:参见教材P276
28
[答案]:ABCD
[解析]:参见教材P278
29
[答案]:BD
[解析]:参见教材P281
30
[答案]:AD
[解析]:参见教材P272
31
[答案]:ABC
[解析]:参见教材P272
32
[答案]:ABCD
[解析]:参见教材P272
33
[答案]:AB
[解析]:参见教材P280
34
[答案]:AB
[解析]:参见教材P280
35
[答案]:BC
[解析]:参见教材P281
36
[答案]:BD
[解析]:参见教材P287
37
[答案]:AB
[解析]:参见教材P290
38
[答案]:BD
[解析]:参见教材P290
39
[答案]:ACD
[解析]:参见教材P289
40
[答案]:AB
[解析]:参见教材P289
41
[答案]:CD
[解析]:参见教材P289
42
[答案]:CD
[解析]:参见教材P289
43
[答案]:ACD
[解析]:参见教材P291
44
[答案]:ABCD
[解析]:参见教材P290
45
[答案]:C
[解析]:参见教材P290