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问题 单项选择题

对（），消费者要求经营者修理、更换或退货的，经营者应承担运输等合理费用。

A、三包的大件商品

B、三包的所有商品

C、三包的家用电器

D、所有商品

答案

参考答案：A

单项选择题 A1/A2型题

对于诊断肺炎球菌性肺炎，下列症状中价值最大的是（）.

A.寒战

B.高热

C.咳嗽、呼吸困难

D.咯铁锈色痰

E.胸痛
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单项选择题

The cost C of manufacturing a certain product can be estimated by the formula C=0, 03rst2, where r and 8 are the amounts, in pounds, of the two major ingredients and t is the production time in hours. If r is increased by 50 percent, s is increased by 20 percent，and t is decreased by 30 percent, by approximately what percent will the estimated cost of manufacturing the product change ？（）

A．40%increase

B．12%increase

C．4%increase

D．12%decrease

E．24%decrease
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