（）是为了消除密封面上的粗纹路，进一步提高密封面的平整度和降低表面粗糙度。
A、粗研；
B、精研；
C、抛光；
D、磨削。
参考答案：B
小题1:My brother got ▲ (marry) last week .
小题2: I’d like to recommend this ____________ (educate) magazines to all the teachers.
小题3:When I heard the bad news , I couldn’t help ▲ (cry)
小题4: Some wild animals look fierce(凶猛的), but they are _(harm).
小题5:Buy the books now before they ▲ (sell) out .
小题6:Lily ▲ (read) a lot of books recently .
小题7:This CD can help you learn English by ▲ (test) your knowledge of English grammar
小题8: Many students use computers in their __________(day) lives.
所谓联邦基金利率是指（）。
A.美国中央政府债券利率
B.美国商业银行同业拆借利率
C.美联储再贴现率
D.美国银行法定存款准备率
