下列各物质的化学式相应的俗名不正确的是A.NaOH烧碱B.Na2CO2纯碱C.CaO生石灰D.CaCO3熟石灰

完形填空（共10小题；每小题1分，满分10分）
阅读下面短文，掌握其大意，然后从第30至第40小题所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。
Going to a Britain school for one year was a very enjoyable and exciting experience for me. I was very happy with the school hours in Britain 31 school starts around 9 a.m. and ends about 3.30 p.m. This means I could get up an hour 32 than usual as schools in China begin before 8 a.m.
On the first day, all students went to 33 assembly. I sat next to a girl whose name was Diane. We 34 became best friends. During 35 , the headmaster told us about the rules of the school. He also told us that the best way to 36 respect from the school was to work hard and 37 high grades. This sounded like my school in China.
My English improved a lot as I used English every day. I usually went to the Computer Club at lunch time, so I 38 e-mail my family and friends back home 39 free. I also had an extra French class on Tuesday evenings. 40 was really fun as I learned how to buy, prepare and cook food.
31. A. because B. if C. so D. though
32. A. earlier B. late C. early D. later
33. A. join B. hold C. attend D. make
34. A. just B. now C. soon D. fast
35. A. assembly B. class C. meal D. break
36. A. take B. earn C. find D. creat
37. A. realise B. achieve C. improve D. develop
38. A. must B. should C. needed D. could
39. A. for B. in C. on D. with
40. A. Eating B. Cooking C. Learning D. playing31—35 ADCCA 36—40 BBDAB

(答案→)31—35 ADCCA 36—40 BBDAB 解析：可联系答.案.网客服索取。

这下我知道了

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D解析分析：根据常见物质的化学式的俗名来判断，NaOH的俗名是烧碱和火碱，Na2CO3的俗名是纯碱，CaO的俗名是生石灰，熟石灰是Ca（OH）2的俗名．解答：A、NaOH的俗名是烧碱和火碱，故A对；B、Na2CO3的俗名是纯碱，故B对；C、CaO的俗名是生石灰，故C对；D、熟石灰是Ca（OH）2的俗名，故D错．故选D点评：解答此题需熟悉常见物质的俗名，熟记常见物质的俗名及会正确书写化学方程式．