题目

把一根1米长的圆柱形木料沿底面直径切割成两个完全一样的半圆柱后，表面积增加了40平方分米，这根木料的体积是   立方分米． 答案：【答案】31.4【解析】1米=10分米；40÷2÷10=2（分米）；3.14×（2÷2）2×10，=3.14×10，=31.4（立方分米）；答：这根木料的体积是31.4立方分米。故答案为：31.4。由题意知，把圆柱形木料切成两个完全一样的半圆柱后，会增加两个切面的面积，并且这两个切面是长跟圆柱的高相等，是1米，宽跟圆柱底面直径相winner，whenever，hardly，find out，unfair，holding，whoever，impossible，cats，In a faraway country，there were two carpenters（木匠）who were both so good at their jobs that no one could tell who was better. One day，the country's king thought of a way to 【1】 which one was better. He would have them compete against each other in a contest. The 【2】 would become the official royal（皇家的）carpenter. Then the contest began. The carpenters were given three days to carve（雕刻）a wooden mouse. 【3】 carved the most lifelike mouse would be the winner. The first carpenter carved a fine mouse which looked like a real one. The second carpenter's mouse，however，looked quite rough. In fact，it 【4】 even looked like a mouse at all. The king and his ministers（大臣）agreed that the first carpenter was the winner. The second carpenter said，"This result is 【5】. We should ask a cat which mouse looks the most realistic. Cats can know mice much better than humans，after all. "The king agreed. He ordered his ministers to catch several 【6】 and bring them to judge the carpenters' mice. Surprisingly，all of the cats were more attracted to the second carpenter's mouse. The king asked the second carpenter，"How did you make the cats believe that your mouse looked more real？”The carpenter said，"Your Majesty（陛下），if you look closely，you can see that I carved a mouse 【7】 a fishbone！The cats care not about how real it looks，but how delicious it might taste. "