21ԹؼжĿжܷ________
A_Ч
BЧشijһЧҪҪļЧˮƽ
C_Ч۱
Drķ
22ܹl۷________
A۳߶ȱ
BƷֲ
C
Dؼ
23ÿнȼһнr仯ķΧͨ________
AÿȪ
BнʷȼʽС
Cнʷȼʽʽ
Dнʷнȼ
24________y(tng)ܹʾⲿƃe̶?
Aн?
BƸ^
CI(y)?
DӖ^չ
25I(y)Ԃ;ÿ仯ʱڻʎŵќ________
AؚFӖO
BʩԂO
CE?
Dݹȥľؚ
26ֻеӖë________Ӗ֧TԍӖõļн֮rITṩ?
AСn
Bn
Cn
D_
27Ӗصָ________
AӖ
Bֻ
CӖ
D
28һԣοɶTн________ڡ
AT
Bق]\ȱ
CTҪ彡oMܳе?
DTI(y)Ұ
29ָTԟﵽ________ĻϣչйطTI(y)Ͷͬ뿪ҵ?
Aһ?
BI(y)һު
CһI(y)
DAB
30________
Aϵ
B
C
D
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