单选题答案：
一、单项选择题
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1
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2
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3
|
4
|
5
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6
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7
|
8
|
9
|
10
|
|
A
|
B
|
C
|
D
|
D
|
A
|
B
|
C
|
C
|
D
|
|
11
|
12
|
13
|
14
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15
|
16
|
17
|
18
|
19
|
20
|
|
D
|
B
|
B
|
A
|
B
|
D
|
C
|
A
|
D
|
B
|
|
21
|
22
|
23
|
24
|
25
|
26
|
27
|
28
|
29
|
30
|
|
D
|
D
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B
|
A
|
C
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A
|
B
|
B
|
D
|
C
|
|
31
|
32
|
33
|
34
|
35
|
36
|
37
|
38
|
39
|
40
|
|
D
|
C
|
C
|
C
|
A
|
D
|
B
|
C
|
D
|
B
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