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23. Could you tell me what is the _____ ofthe experiment?

 A. result          B.account           C.reason            D.increase

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22. One of the consequences of our planet’sbeing warning up is a(n) _____ in the number of natural disasters. (2003上海)

 A. result          B.account           C.reason            D.increase

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21. Air is a _____ of gases.

 A. variety         B.mixture           C.extension          D.combination

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20. More and more people choose to shop ina supermarket as it offers a great _____ of goods. (2003上海春)

 A. variety         B.mixture           C.extension          D.combination

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19. There is no _____ to doubt the truth ofthe statement.

 A. occasion        B.case             C.situation          D.background

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18. Please remind me of it again tomorrowin _____ I forget.

 A. occasion        B.case             C.situation          D.background

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17. The collapse of the World Trade Centrehas put USeconomy in a difficult _____. (2003上海春)

 A. occasion        B.case             C.situation          D.background

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16. --- What is the _____ for your being late?

 --- I am sorry I missed the first bus.

 A. reason          B.excuse            C.cause            D.explanation

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15. --- I am sorry I stepped outside for asmoke. I am very tired.

 --- There is no ______ for this while you are on duty. (2003北京)

 A. reason          B.excuse            C.cause            D.explanation

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14. The manager has got a good _____ to dothe business so the company is doing well.

 A. idea               B.sense             C. thought           D.thinking

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