C. the Internet is always unsafe for the children

　　D. poisonous information may have a bad effect on children

　　49. The harm of a computer virus is that ________.

　　A. it can change the saved data in computer

　　B. it can reproduce the computer

　　C. it can make the computer operate ill

　　D. it can destroy the saved files and the computer itself

　　50. We can infer from the passage that the key to solving the problems with the Internet is ____.

　　A. to improve the computers

　　B. to improve people’s moral (道德的) level

　　C. to order people not to use the Internet

　　D. to find a medicine to kill computer viruses

　　C

　　A modern life has become more comfortable and convenient, there has been a growing trend to use things once and then throw them away. Many kinds of environmental problems have been caused by this, including air and water pollution, destruction of natural environment, global warming, and a great deal of waste. Environmental protection is an important task not only for Japan but also for the whole world. Led by the Japanese government, Japanese people are making great efforts for environmental protection.

　　The price of the convenience of modern life is the generation of a lot of waste. Japan has made great progress in cutting down the amount of waste and recycling used products. The recycling of cans and plastic bottles is especially well established in Japan.

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