【名词&注释】
不锈钢(stainless steel)、亚硫酸钠(sodium sulfite)、化合价(valence)、食盐水(salt water)、石灰水(limewater)、春暖花开、酒瓶盖(bottle cap)、无规则运动(random motion)
[单选题]下列物质中，属于纯净物的是
A. 澄清的石灰水
B. 新鲜的空气
C. 不锈钢
D. 干冰
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举一反三：
[单选题]BNews 1
A. Last Saturday， the American X-43A airplane made its first flight． It reached a speed of 8，000 kilometres an hour． This makes it the fastest plane in the world． The X-43A is only three to four metres long， but it，s very heavy: it weighs 1，270 kilogrammes．
B. News 2
C. Last week， China started checking textbooks， dictionaries and children’s books all over the country． The government(政府：) said the results of the checking would come out at the end of June．
D. News 3
E. It was reported on Monday． The heavy rain hit the state all night last Friday， so some banks of the river were broken． Along the river about 3，000 families were seriously af-fected．
F. News l talks about ________．
G. people can't go round the earth in a few hours
H. the American X-43A airplane traveled round the earth in a few hours
I. the American X-43A airplane is the fastest one in the world
J. only Americans can make such a fast plane
[单选题]9．—Let's go to see a comedy!—________． Let’s play tennis．
A. Let's go
B. That sounds boring
C. Yes，we do
D. You're welcome
[单选题]18．
A. start with
B. agree with
C. deal with
D. come up with
[单选题]Which of the following is NOT true according to the passage?
A. Child Care Centre doesn’t provide care for children of all ages.
B. Teachers are wanted to teach English in the Language Centre.
C. One with computer skills will be preferred to head the bank.
D. Your own information is available for the position of the editor.
[单选题]（2009?重庆）据报道，用于清洗龙虾的“洗虾粉”中含有柠檬酸钠、亚硫酸钠（Na2SO3）等物质，可能对人体的健康产生危害。Na2SO3中S元素的化合价为（ ）
A. ＋6
B. ＋4
C. ＋2
D. －2
[单选题]Aboutthepreparedwater,whichdescriptionisRIGHT?
A. Apersonshouldprepare0.5gallonofwaterforoneday.
B. You’dbetteruseyourowncontainerstokeepwater.
C. You’dbetteropenthebottledwaterwhenyoubuyit.
D. Youshouldn’topenthebottledwateruntilyouneedit.
[单选题]下列现象中不能说明分子在做无规则运动(random motion)的是
A. 春暖花开时，能闻到花的香味 B．打开酒瓶盖(bottle cap)能闻到酒的气味
B. 空气中飘动的浮尘 D．在盛有热水的杯子中放几片茶叶，过一会整杯水都变成茶水
[单选题]下列有关溶液性质的说法中错误的是
A. 煮沸的咸汤比煮沸的水温度高
B. 溶液一定是无色透明的
C. 食盐水能导电是因为食盐水中含有较多自由移动的离子
D. 消除路面上的积雪可以撒些盐，使冰雪较快融化
[单选题]9． This T-shirt is very old，________I like it very much．
A. because
B. or
C. but
D. and
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