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问题 选择题

已知10x=m，10y=n，则102x+3y等于（　　）

A．2m+3n

B．m2+n2

C．6mn

D．m2n3

答案

102x+3y=102x?103y=（10x）2?（10y）3=m2n3．

故选D．

单项选择题

Calvin: Fire insurance policies are disadvantageous to policyholders. The typical policyholder always pays more in premiums than he or she collects in payments on policies.
Lorraine: Yes, but policyholders are still right in thinking that it is to their advantage to hold an insurance policy. The peace of mind that comes from having an insurance policy is the main advantage to the policyholder.
Lorraine addresses Calvin’s argument by

A．questioning the source of Calvin’s factual information.

B．introducing a consideration neglected by Calvin’s argument.

C．showing that Calvin’s argument assumes what it sets out to prove.

D．challenging the truth of the evidence advanced in Calvin’s argument.

E．(E) showing the irrelevance of Calvin’s evidence to the conclusion he draws.
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单项选择题 A1型题

阿司匹林可用于：

A．胆绞痛

B．胃肠痉挛绞痛

C．月经痛

D．术后剧痛

E．心绞痛
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