题目

已知圆柱的底面直径为4cm，高为5cm，则圆柱的侧面积是           (    )A．10cm2B．10兀cm2C．20兀cm2 D．40 兀cm2 答案：C解析:π×4×5=20πcm2．故选C Mother's Day is a holiday for mothers. It is celebrated in the United States, England, India and some other countries. In a short time, it becomes widely celebrated. Mother's Day falls on the second Sunday in May. On that day many people send gifts of love to their mothers. Those whose mothers are still living often wear a pink or red rose or carnation（康乃馨）, while those whose mothers are dead wear a white one.The idea of a day for mothers was first given by Miss Anna Jarvis of Philadelphia. As a result of her hard work, the celebration of the first American Mother's Day was held in Philadelphia on May 10, 1908. Soon the holiday became popular all over the country and around the world.In China, people do the same on the day for mothers. And, in some cities, people sometimes ask a song to be broadcasted for his or her mother only. This might cost a little money for some of them, but, as it is said, "Love is invaluable."On May 8,1999, just the day before the Mother's Day that year, a Chinese mother, a heroic（英雄的）mother was killed in criminal bombing（罪恶轰炸）in Yugoslavia（南斯拉夫）. Her name is Shao Yunhuan, a reporter who wrote lots of articles（文章）for Chinese newspapers, All the Chinese will remember her forever.1.Mother's Day ________.A.is a holiday for mothersB.is celebrated in the United States onlyC.falls on May 10 every yearD.was given by Miss Anna Jarvis2.What was the date of the Mother's Day in 1999?A.may 7, 1999. B.May 8, 1999.C.may 9, 1999. D.May 10, 1999.3.On Mother's Day, people ________.A.send some flowers to their mothersB.wear a pink or red rose or carnationC.wear a white flowerD.send gifts of love to their mothers4."Love is invaluable." here the word "invaluable" means "________".A.beautiful B.extremely valuableC.expensive D.useful5.In some cities of China, what do people do for his or her mother only?A.Sing a song. B.Write a song.C.Ask a song to be broadcasted. D.Listen to the broadcast.6.Maybe you've known the criminal bombing, which of the following ideas do you agree to?A.Shao Yunhuan is a heroic mother.B.A Chinese mother is very brave.C.The bombing cannot get away with the crime.D.All of the above.