0  430619  430627  430633  430637  430643  430645  430649  430655  430657  430663  430669  430673  430675  430679  430685  430687  430693  430697  430699  430703  430705  430709  430711  430713  430714  430715  430717  430718  430719  430721  430723  430727  430729  430733  430735  430739  430745  430747  430753  430757  430759  430763  430769  430775  430777  430783  430787  430789  430795  430799  430805  430813  447090 

2.    

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1. 已知等差數(shù)列的前n項(xiàng)和為,若M、N、P三點(diǎn)共線,O為坐標(biāo)原點(diǎn),且(直線MP不過點(diǎn)O),則等于        .

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10.(★★★★)Tom couldn’t work the problem out because he wasn’t ________ clever.

A.much             B.that              C.a little                D.as

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9.(★★★★★)It’s quite late now but Mr.Li________ hasn’t turned up.

A.yet              B.already            C.still                  D.however

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8.(★★★★)-Where have you been?

-I’ve ________ been to the library.

A.ever              B.already            C.just                  D.nearly

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7.(★★★★★)The lessons given by Mr.Smith are always________ and interesting.

A.loving            B.lovely            C.lively                D.vividly

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6.(★★★★★)-Did all of them go to the cinema?

-No.They________ went to the concert instead.

A.almost            B.mostly            C.most                 D.nearly

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5.(★★★★★)Jim is a kind boy.He is________ willing to help his classmates.

A.so               B.much             C.too                  D.such

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4.(★★★★★)It was________ impossible for him to finish the work alone by five o’clock in the morning.

A.very             B.quite             C.too                  D.much

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3.(★★★★)-Can I help you?

-Well,I’m afraid the box is________ heavy for you,but thank you all the same.

A.so               B.much             C.very                 D.too

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