21. We can never expect bluer sky unless we create less polluted world. ks5u
A. a; a B. a; the ks5 C. the; a D. the; the ks5u
【答案】A
【解析】本题考察冠词的用法,因为sky和world原本是独一无二的,但这里前面都有了形容词修饰,表示会出现一个什么样的sky和world,这里就属于泛反指了。
22. – I wonder how much you charge for your services.
-- The first two are free the third costs $30.
A. while B. until C. when D. before
【答案】A
【解析】这里起转折作用,while表示”但是”,可接句子.”前两个免费,但第三个要收费30元”。
23. Daniel's family their holiday in Huangshan this time next week.
A. are enjoying B. are to enjoy C. will enjoy D. will be enjoying
【答案】D.本题关键点最后四个单词”this time next week”是将来进行时的标志。
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