题目

已知水稻的体细胞中有12对染色体，那么（      ）     A 体细胞中含12个DNA分子    B 生殖细胞中含12个DNA分子      C 生殖细胞中含5 对染色体    D 精子和卵细胞中所含染色体数目不同 答案：B根据短文内容，从短文后的选项中选出能填人空白处的最佳选项。选项中有两项为多余选项。Avoid Internet Addiction__1.___ Many people suffer from addition to the Internet and have a hard time paying attention to the important things around them. How can we prevent ourselves from going online too much?Admit you have an addition. ___2.__ Realize more and more people in the world are becoming addicted. You are not the only one with this problem. Do not be embarrassed; find others with the same problem and help each other beat it.Limit your computer time. Make sure not to turn it on too many times a week. Before using your computer, decide on a time limit such as 30 minutes. Set the clock and make sure that you get off the computer when the time is up. ___ 3.___ Try using the computer at the library. You won’t be as attracted to look at certain websites and they do have a limit on how long you can stay online. ___4.____. So you won’t be as attracted to be on the Internet as at home. ___5.___ Go for a run with a friend or get exercise some other way. Keep up with the local events in your neighborhood. There may be talks, films, concerts and sports events etc. Find some, as long as it is not on theInternet, and get involved.A. You will be happier if you use the Internet less.B. There is no use avoiding the truth.C. Also, it is a good place to get some good books and magazines to read.D. Get a hobby or an interest.E. Internet addition affects a lot of people.F. Get your friends to remind you if you’ve been on a long time.G. Try to reduce the amount of time by 5 minutes each time.