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2.  预习提纲:

(1)    判断、证明函数单调性的通法;

(2)    判断、证明函数奇偶性的通法。

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20.I’ve never seen anyone run so fast-______David go.

A.just watch                 B.just to watch

C.just watching             D.just having watched

解析:本题考查非谓语动词的用法。根据句子的意思和语境分析,此处应该是祈使句型,所以使用动词原形。

答案:A

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19.An excellent idea ______ to me when I woke up this morning.

A.happened      B.broke out     C.thought of       D.occurred

解析:短语occur to sb.表示“(想法、念头等)想起、浮现”的意思。

答案:D

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18.______ that the problem was more than he could deal with,he called the police for help.

A.Having been realized            B.To realize

C.Realized                D.Realizing

解析:本题考查非谓语动词作状语的用法。根据主句主语he和动词realize之间的逻辑关系,此处应该表示主动,故可先排除A、C两个表示被动的选项。B项表示目的,和语境及句子意思不相符。

答案:D

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17.You’ve missed your ______ to speak and you have to wait for another round.

A.turn       ce         C.order       D.opportunity

解析:从后面一句话所提供的another round“另一轮次”分析,此处应该使用turn。

答案:A

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16. Being in no great hurry,______.

A.we went the long route with scenery

B.the long,scenic route was our preference

C.we took the long,scenic route

D.our preference was taking the long,scenic route

解析:本题考查非谓语动词作状语时的用法。按照英语句子结构的要求,当非谓语动词作状语时,其逻辑主语必须和主句的主语一致,所以先排除A、D两项。而A项的动词受汉语意思的影响而误用。

答案:C

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15.More and more people choose to shop in a supermarket as it offers a great ______ of goods.

A.variety        B.mixture      C.attention     D.kind

解析:短语a variety of的意思为“丰富多彩的;多种多样的”。

答案:A

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14.I was so badly ill that I couldn’t help ______ the room.

A.clean       B.cleaning      C.being cleaning     D.to be cleaned

解析:根据语境分析,此处的意思是“病得太重,无法帮助打扫房间”,不要理解为can’t help doing“情不自禁地做某事”。

答案:A

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13.We have to ______ the wheat as soon as possible because a storm is on the way.

A.get away      B.get across       C.get through      D.get in

解析:本题考查动词短语的辨析。短语get in可以表示“收割庄稼”的意思。

答案:D

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12.We thought of selling this old furniture,but we’ve decided to ______ it.It might be valuable.

A.hold on to       B.keep up with    C.turn to        D.look after

解析:此题考查短语的正确选用。根据后句话的意思,此空中应填有“留着(not sell)”的意思的词,故用A项。

答案:A

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