今年世界各国频发地震。为防止震后疾病传染须对饮用水源进行处理

【名词&注释】

世界各国(world)

[单选题]今年世界各国频发地震。为防止震后疾病传染须对饮用水源进行处理，采取的措施有：①煮沸②消毒③过滤④自然沉降，合理处理的顺序是

A. ③①②④
B. ②④③①
C. ④③①②
D. ④③②①

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学习资料：

[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]13．

A. So
B. Or
C. And
D. But

[单选题]44．Let's_______ right now．

A. go to school
B. to go to school
C. to go school
D. go school

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