27. Each player tried his best to _________ the game.
A. beat B. defeat C. catch D. win
26. He is always telling lies. Don’t be __________ by his sweet words.
A. taken on B. taken over C. taken in D. taken away
25. _______ the days going on, the weather is becoming hotter and hotter.
A. With B. Since C. While D. As
24. We tried to ______ his doubts and let him tell the truth.
A. replace B. review C. remove D. rebuild
23. Advertisements are a good __________ sell products or services.
A. means to B. way of C. way to D. approach to
22.Violence (暴力) computer games may have a bad ____________ on children.
A. affect B. pressure C. influence D. power
第一节: 单项选择 (共15小题;每小题1分,满分15分)
从A、B、C、D四个选项中,选出可填入空白处的最佳选项。
21. Mary is often heard ________ playing piano in the next room in the evening.
A. practise B. to practise C. practising D. practiced
20.(本题满分16分)
设数列的前项和为,若对任意,都有.
⑴求数列的首项;
⑵求证:数列是等比数列,并求数列的通项公式;
⑶数列满足,问是否存在,使得恒成立?如果存在,求出 的值,如果不存在,说明理由.
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