
【名词&注释】
化学反应(chemical reaction)、催化作用(catalysis)、硝酸铵(ammonium nitrate)、化学性质(chemical properties)、硫酸钾(potassium sulfate)、磷矿粉(rock phosphate)、刺激性气味(pungent odour)、记数法(numeration)、空白处、氧化氢
[单选题]用科学记数法(numeration)表示660 000的结果是
A. 66×104
B. 6.6×105
C. 0.66×106
D. 6.6×106
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举一反三:
[单选题]14.
A. worry about
B. pay for
C. ask for
D. make sure
[单选题]下列化肥中,从外观即可与其他化肥相区别的是( )
A. 硫酸钾
B. 硝酸铵
C. 磷矿粉
D. D氯化钾
[单选题]25. _______likes September very much.
A. Joe
B. Joe's father
C. I
D. Joe's mother
[单选题]28, Which of the following about News 2 is TRUE?A, There are many mistakes in most of the textbooks, dictionaries and children's books.
A. All the students have to use the books full of mistakes till the end of June.
B. After the checking, books will become better and better.
C. A few mistakes are not serious for children.
[单选题]5. —Good morning, I'm Jim Green, your new manager.—Good morning,________.
A. Mr Jim
B. Mr Green
C. Mr Jim Green
D. Green manager
[单选题]---Whatisyourfavouritesport?---Swimming,Ithink.It’s_____ofall.
A. earsier
B. moredifficult
C. themostinteresting
D. themostboring
[单选题]下列说法中不正确的是( )
A. 在过氧化氢溶液的分解反应中,二氧化锰起催化作用
B. 氧气的化学性质很活泼,在常温下能与所有物质发生化学反应
C. 细铁丝在氧气里燃烧时,火星四射,生成黑色固体
D. 用排水法可以收集不易溶于水的气体
[单选题]下列说法中正确的是( )
A. 木炭燃烧后生成黑色固体
B. 铁丝伸入盛有氧气的集气瓶中剧烈燃烧
C. 红磷在空气中不能燃烧
D. 硫燃烧后生成有刺激性气味(pungent odour)的气体
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