27. Ten years ________a long time in one's life.
A. has been B. are C. is D. have been
26. - It’s the office! So you know eating is not allowed here.
- Oh, sorry.
A. must B. will C. may D. need
25. It is known to all that ____ computer was invented in the USA.
A. that B. / C. the D. one
24. You will be late _____ you leave immediately.
A. unless B. when C. while D. as
23. Don’t leave your keys in the car. Someone might steal ________ .
A. one B. that C. this D. it
22. we can avoid _________ with rest and a balanced diet. A. ill B. to get ill C. getting ill D. be ill
第一节 单项填空 (共10小题;每小题1分,满分10分)
从A、B、C、D四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。
例 It is generally considered unwise to give a child _______he or she wants.
A however B whatever C whichever D whenever
答案是B。
21. Expo 2010 Shanghai China __________ on both ba{007}nks of the Huangpu River in the city of Shanghai, China, from May 1 to October 31, 2010.
A. is being held B. is holding C. will hold D. holds
25、(2009苏州)某课外活动小组为了测定一批石灰石中碳酸钙的质量分数,将石灰石样品研成粉末,然后取一定量的石灰石粉末与过量稀盐酸充分反应(假设石灰石中的杂质既不和酸反应,也不溶于水),过滤、洗涤、干燥后称量滤渣质量的数据如下表:
实验序号 |
样品的质量/g |
滤渣的质量/g |
第一次 |
3.4 |
0.3 |
第二次 |
3.6 |
0.4 |
第三次 |
5.0 |
0.5 |
(1)该样品中碳酸钙质量分数的平均值为: (结果精确到0.1%)。
(2)引起三次实验数据差异的操作原因可能是: 。
(3)若利用题(1)的结果,煅烧100t这种石灰石,理论上最多能得到氧化钙多少吨?(结果精确到0.1t)
2010年黄冈市西河中心学校化学复习专题之第五单元中考复习
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