Bsince; when C．since; before

　　Dwhen; before

　　答案：C

　　解析：考查连词用法。It is＋一段时间＋since＋句子，自从……以来已有多久，since从句中的谓语动词用一般过去时；It will be＋一段时间＋before＋句子，再过多久才……，从句谓语用一般现在时表示将来；或It was＋一段时间＋before＋句子，没多久就……，从句谓语用过去时，故选C。

　　Ⅲ .阅读理解

　　A

　　A typical Chinese Internet user is a young male who prefers instant messaging to e－mail, seldom makes online purchases and favors news, music and games sites. According to a study, about twothirds of survey participants use the Internet for news－often entertainment－related—or for online games. About half download music and movies.

　　They also tend to prefer instant messaging to email, and they are depending on the Internet more frequently than before to communicate with others who have the same professions, hobbies and political interests. Online purchases still remain

　　unpopular in China. Threequarters of users surveyed have never bought anything over the Internet, and only 10 percent make purchases even once a month. Among those who do buy online, most pay for entertainment while others buy phone cards, or computer hardware or software.

　　“Many people don‘t trust the quality of goods bought online， Guo said Wednesday. “If they buy it in a store and don’t like it, they can easily bring it back.”

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