问题
填空题
将一个棱长20厘米的正方体石料加工成一个最大的圆柱，石料利用率是______．
答案
正方体的体积：20×20×20=8000（立方厘米）；
圆柱的体积：3.14×（20÷2）2×20
=3.14×100×20
=6280（立方厘米）；
利用率：6280÷8000×100%=78.5%．
答：石料利用率是78.5%．
故答案为：78.5%．
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将一个棱长20厘米的正方体石料加工成一个最大的圆柱，石料利用率是______．
正方体的体积：20×20×20=8000（立方厘米）；
圆柱的体积：3.14×（20÷2）2×20
=3.14×100×20
=6280（立方厘米）；
利用率：6280÷8000×100%=78.5%．
答：石料利用率是78.5%．
故答案为：78.5%．
Many young people want to be pop stars. Pop stars are rich. Many people think they are leading a happy and easy life. Is that true? The answer is definitely no. In fact, they have very hard lives. They spend much of their time on travel. Sometimes the travel is interesting, but in most time it is boring to pop stars. The following chart is a day’s life of a pop star.
小题1: The pop star went back to the hotel _________ on Feb. 10, 2007.
小题2: According to the chart, the pop star was good at _________.
小题3: The pop star felt ________ after the performance.
小题4:The band did _________ in the rehearsal (彩排) in the night’s show.
小题5:This passage mainly tells us that _________.
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