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问题 选择题

2012年初93号汽油的价格a元，3月份降低10%后，5月份又降低了10%，由国际原油上涨，发改委决定在10月份提价20%，提价后93号汽油的价格为（　　）

A．a元

B．1.08a元

C．0.972a元

D．0.96a元

答案

第一次降价后的价格为a×（1-10%）=0.9a元，

第二次降价后的价格为0.9a×（1-10%）=0.81a元，

∴提价20%的价格为0.81a×（1+20%）=0.972a元，

故选：C．

改错题

Last evening, I went to teahouse with my best friend Susan. Before the tea was serving, we talked to each other happily. When the waiter went to us with the tea, we didn’t see him. Unfortunately, Susan rose her hand to comb her hair just while the waiter bent to put the plate on the table. His hand hit the cup, and the tea was spattered (溅) on her trousers. In my surprise, instead of complaining , Susan smiled, “ So lucky that it’s not on my shirt, and I can’t even clean it.” Her words were very inspired. We can’t foresee what will happen, but looking at it in a positive way can make us be happy
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单项选择题

为了避免流程图在描述程序逻辑时的灵活性，提出了用方框图来代替传统的程序流程图，通常也把这种图称为( )。

A．PAD图

B．N-S图

C．结构图

D．数据流图
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