【判断题】气门处于关闭状态时,必须有一定的预紧力,否则容易漏气。
【单选题】He may be a working-class boy ______, but his lifestyle has been changed.
【单选题】从新中国成立到改革开放之前,我国的行政管理支出占财政支出的比重呈现( )的趋势。
【简答题】The student who wants a newspaper career has much hard work ahead of him before he can become even a cub, or beginning reporter. He may begin by working on his high school newspaper or yearbook. Then ...
【简答题】I saw him leave the office an hour ago . He ____ at this time . A.mustn''t be working B.can''t be working C.can''t work D.may not being working