5.30
完成单项选择+语法+六选四，注意题目序号
单选
21 ____________
22 ____________
23 ____________
24 ____________
25 ____________
26 ____________
27 ____________
28 ____________
29 ____________
30 ____________
语法
31 ____________
32 ____________
33 ____________
34 ____________
35 ____________
36 ____________
37 ____________
38 ____________
39 ____________
40 ____________
六选四
74 ____________
75 ____________
76 ____________
77 ____________