题目

观察下列算式：21=2、22=4、23=8、24=16、55=32、26=64、27=128、28=256…．观察后，用你所发现的规律写出22010的末位数字是 ． 答案：4 ． 【考点】尾数特征． 【分析】根据2n的末位数字为2、4、8、6四个一循环，所以根据2010÷4=502…2，得出22010的末位数字与22的末位数字相同，由此求出答案． 【解答】解：2n的末位数字为2、4、8、6四个一循环， ∵2010÷4=502…2， ∴22010的末位数字与22的末位数字相同，是4， 故答案为4． 【点评】本题考 阅读理解 　　Popular music is very popular with American students．Almost all students carry small radios with earphones and listen to music before class, after class, and at lunch．Students with cars buy large speakers and play music loudly as they drive on the street．Adult drivers listen to music on the car radio as they drive to work．They also listen to the news about sports, the weather, and the life of American people．Most of the radio programmes are music． 　　Pop or popular music singers make much money．They make CDs or tapes which radio stations in many places broadcast(广播)．Once the popular singer is heard all over the country, young people buy his or her tapes．Some of the money from these tapes comes to the singer．Wherever the singer goes, all the young people want to meet him or her．Now the singer has become a pop star． 　　There are other kinds of music that are popular among Americans．One is called folk music．It tells stories about the common life of Americans．Another is called western or country music．This was started by cowboys who would sing at night to the cows they were watching．Today, any music about country life and the love between a country boy and his girl is called western or country music． (1) ________ kinds of music are mentioned in this passage． [　　] A． Two B． Three C． Four D． Five (2) When pop singers ________, they are regarded as pop stars． [　　] A． make much money B． make a CD or tape C． become popular with their fans D． are wanted to sing on the radio (3) From the passage we know that country music is about the ________． [　　] A． common life of Americans B． country life and love stories C． life of cowboys D． school life in America (4) Which of the following is true? [　　] A． Few students in America like popular music． B． Students with cars in America like to listen to music while driving． C． Adult drivers in America only listen to music while driving． D． Everyone in America wants to meet pop singers wherever they go． (5) What would be the best title for this passage? [　　] A． American Music B． Popular Music C． History of Music D． Western Music