27.The boy tried his best to make himself in his English.
A. understood; breaking B. understand; breaking
C. understand; broken D. understood; broken
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
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
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
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
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
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
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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