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27.The boy tried his best to make himself      in his      English.

    A. understood; breaking                  B. understand; breaking

    C. understand; broken                   D. understood; broken

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26. All his attempts to unlock the door were   , because he was using the wrong key.

    A. in return         B. in vain            C. in doubt          D. in time

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25. It was after years of hard work that his dream    a lawyer finally    .

    A. of becoming; came true                  B. to become; come true

    C. of becoming; realized                  D. to become; realized

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24. It suddenly    to me that this was something that I should never do, so I

  turned down her request.

    A. happened         B. hit               C. struck           D. occurred

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23. --- Is the food served in the restaurant tasty?

  ---I’m sure that    else in this town can you find a better restaurant.

    A. anywhere         B. nowhere          C. everywhere       D. somewhere

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22.    is known to us all is    the old scientist, for whom life was hard in the

  past, still works very hard in his eighties.

    A. What; what       B. What; that         C. That; what        D. As; that

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21.      helicopter can take off and land straight up or down, and can also stay

  still in    air.

    A. The; an         B. A; the           C. A; 不填         D. The; 不填

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25、(12分)实验室用如图所示的装置制取乙酸乙酯.

(1)在大试管中配制一定比例的乙醇、乙酸和浓硫酸的混合溶液的方法是:                     ,然后轻轻振荡试管,使之混合均匀。

(2)装置中通蒸气的导管_________________________,目的是_______________。

(3)浓硫酸的作用是①___________; ②___________

(4)饱和Na2CO3溶液的作用是①________________________;②_____________________; ③_____________________________

(5)生成的乙酸乙酯的化学方程式                 

(6)若实验中温度过高,使反应温度达到140℃左右时,副反应的主要有机产物是_____________(填物质名称).

2009-2010下学期长海高中期末考试

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