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约3520字。
　　寒假作业6
　　I. 单项填空。从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
　　1．—Shall I lock the lab now before I go home?
　　—. I’ll check it myself later.
　　A．Go ahead B．No problem C．No hurry D．Don’t bother
　　2．Only when you stay and live with local people for a period of time will you have
　　better understanding of life here.
　　A．a; / B．the; a C．/; the D．the; the
　　3．We spent 16 glorious days in August the athletes’joys and tears, and we were amazed at their ability.
　　A．shared B．to share C．sharing D．share
　　4．There you can see beautiful tall buildings on side of the square.
　　A．all B．either C．both D．every
　　5．If a puter crashes, you will lose the file you on unless you save it regularly.
　　A．are working B．work C．will work D．worked
　　6．Each of us, old or young, is a valuable member of society.
　　A．however B．whenever C．whoever D．whatever
　　7．We last night, but we went to appreciate the flowerbeds and streetlights in Tiananmen Square instead.
　　A．might study B．could study
　　C．should have studied D．must have studied
　　8．In September 2008, China’s key milestone in space travel when Zhai Zhigang conducted the first space walk.
　　A．reached B．was reached C．has reached D．had been reached
　　9．This is a city which lives for today while by its past.
　　A．surround B．surrounding C．surrounded D．to surround
　　10．There is a saying swimming is a good way to keep fit.
　　A．which B．what C．that D．where
　　11．Private cars are required to turns off roads one out of five weekdays the traffic pressure.
　　A．to reduce B．reducing C．reduce D．reduced
　　12．There are many kinds of birds in Australia, and over 140 species of snakes, many of_____ are extremely dangerous.
　　A．them B．which C．what D．those
　　13．How can you expect to get anything you never give?
　　A．in case B．even if C．unless D．when
　　14．—The head teacher said we had only three days to finish the project.
　　—Don’t worry. We have already two thirds of it.
　　A．taken over B．got through ade up D．given away
　　15．—busy schoolwork, the children also have to take arts, music and sports classes in their free time.
　　—I wonder what they will bee.
　　A．Rather than B．Owing to C．Except for D．Apart from
　　II. 阅读下面短文，掌握其大意，然后从各题所给的四个选项（A、B、C和D）中，选出最佳选项。