【名词&注释】
市场调查(market research)、化学性质(chemical properties)、化学反应速率(chemical reaction rate)、稀有气体(noble gas)、农科所
[填空题]经市场调查，某种优质西瓜质量为（5±0.25）kg的最为畅销.为了控制西瓜的质量，农科所采用A、B两种种植技术进行试验.现从这两种技术种植的西瓜中各随机抽取20颗，记录它们的质量如下（单位：kg）：
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举一反三：
[单选题]空气是一种宝贵的资源，空气中体积分数约占21%的是
A. 二氧化碳
B. 氮气
C. 氧气
D. 稀有气体
[单选题]下列关于催化剂的说法正确的是（ ）
A. 在化学反应后其质量减小
B. 在化学反应后其化学性质发生了变化
C. 在化学反应后其质量增加
D. 催化剂能改变化学反应速率
[单选题]CThey wear the latest fashions with the most up-to-date accessorise(配饰)。Yet these are ginrls in their teens or twenties but women in their sixties and seventies.A gengration which would once only wear old-fashioned clothes is now faouring the same high street looks worn by those half their age.
A. Professor Julia Twigg, a social policy expert , said ,“Wimen over 75 are now shopping for clothes more frequently than they old when they were young in the 1960s .In the 1960s buying a coat for a woman was a serious matter . It was an expensive item that they would puechase only every three or four years — now you can pick one up at the supernnackrt whosever you wish to .Fashion is a lot cheaper and peope fet tired of things more quickiy . ”
B. Fashion designer Angela Barnard ,who runs own fashion business in London ,said older women were much more affected celebrity(名流) style. than in previous years .
C. She said ,“When people see stars such as Judi Dench and Helen Mirren looking attractive and fashionable in their sixties ,they want to follow them . Older women are much more aware of celebrities .There’s also the boom in TV programmes showing people how they can change theiy look,and many of my older customers do roga to stay in shape well in their fifties . When I started my business a fen years ago .my older customers wended to be very rich, but now they are what I would call ordinary women .My own mother is 61 and she wears the latest fashions in a way she would caill ordinsry women .My own mother is 61 and she wears the latest fashions in a way she would never have done ten yeare ago.”
D. 59. Professor Twigg found that ,compared with the 1960s,_______.
E. the price of clothes has generally fallen by 70%
F. the spending on clothes has increased by 5% or 6%
G. people spend 30% less than they did on cotothes
H. the amount of chothes bought has risen by 5% or 6%
[单选题]5． —Why do you like Beijing Opera?—Because I can _______a lot _________Chinese history．
A. learn; about
B. study; about
C. learn; for
D. study; for
[单选题]7．
A. with
B. about
C. for
D. except
[单选题]3．Why not_________your position?
A. considering changing
B. considering to change
C. consider change
D. consider changing
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