第7题: [单项选择]The bicycle______by Mr. Zhang's brother now. A. has been repaired B. is being repaired B. is repaired C. has repaired 参考答案:B 答案解析:[解析] 本题考查时态的用法。根据时间状语“now”可以判断,应该用动词的现在进行时。主语为“the bicycle”,因此应使用现在进行时的被动结构。
第8题: [单项选择]What was the man’s excuse for having been late this time A. He forgot to set the alarm. B. His clock was broken. C. He did the booking too late. 参考答案:A 答案解析:[听力原文] 11-13 W: Morning, Jerry! You are late again! M: Oh, Sally. I’m terribly sorry. W: So
第27题: [单项选择]雄黄的主要成分是( ) A. 三氧化二砷(As2O3) B. 二硫化二砷(As2S2) C. 含水硫酸钠(Na2SO4·10H2O) D. 含水硅酸镁[Mg(si4O10)(OH) 2] E. 含水硫酸钙(CaSO4·2H2O) 参考答案:B 答案解析:矿物类药材的分类是以所含的化学成分为根据的,通过化学成分分析,进行定性和定量,对外形特征不明显或粉末状、剧毒等中药,尤为重要,所以应该记住常用的矿物类药材的成分。如石膏的主要成分是含水硫酸钙。信石的主