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C.火是有用的,但也是危險的,前后句表示轉折,所以用but,故選B。and【答案】 A 【解析】【分析】句意: 如果明天下雨,我們該怎么辦?D.B.A 不是……而是……,B 不僅……而且……,C 兩者都不,D 兩者之一不。neither。——春天、夏天、秋天或冬天。B.where【答案】 A 【解析】【分析】句意:如果船停在港灣里是安全的,但這不是它被造的目的。how因題干前半句和后半句是遞進關系,故答案選C。orD.B.since【答案】 B 【解析】【分析】句意:除非你改變你的飲食習慣,否則你不能減肥。t able to lose weight _______________ you change your eating habits. A.D. has ——既然你只剩下一張票,要么我妹妹要么我和你一起去。C. andD. Not until18.— ________ will the meeting last? —until 【點評】考查形容詞辨析,注意連詞so的用法。B.good enough: butC.when【答案】 A 15.You can take___________ the train___________ the bus there. It will take the same amount of time. A.iforin order towhen【答案】 B 8.—Learning to love is like learning to walk. —Yes, ______ we step out bravely, we39。until【答案】 D 7.—The air pollution is terrible. —It will be worse ______ we take action to protect the environment.A.because【答案】 B 6.Some people won39。C.C.butwhichD.WhenD. 【點評】考查連詞辨析。C.B.C.B.B.unless【答案】 D 12.Study hard, _______ our parents will be disappointed. A.because【答案】 C 13.She got up very early that day __________ she could catch the first train. A.t watch the live match on TV yesterday evening. A.both andD.well enough。since故選B。 When。19.— Since you have one ticket left, ____ my sister_____ I will go with