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相关题目

15．The flight is late，so they should apologize for it．

4．PM2.5---Invisible （看不见的）Killer

Country	City	PM2.5concentration （浓度）	Family （million）	Cars （million）	Ways to control PM 2.5
China	Beijing	1.121	6.9	5.2	In January 2012，PM2.5was first tested（检测） by China．Beijing，Shanghai，Tianjin，Shandong and Wuhan have taken action to test PM 2.5step by step．
Japan	Tokyo	0.023	4.3	8	Japanese experts all agree PM2.5comes from the tail gas of the car．They use the white towel to test tail gas．
America	New York	0.021	6	8	In 1997，America first set up a level to test PM2.5．They use colors to show the air quality．Green means"good"．Orange means"dangerous"．Red means"unhealthy"．
England	London	0.029	2.7	4	We can test air quality （质量）by phone and show it to the public．

根据表格所提供的信息选择最佳答案．

51．According to the information above，PM 2.5concentration（浓度） inAthe highest．
A．Beijing
B．Tokyo
C．London
52．A first set up the test level for PM2.5．
A．The US
B．China
C．The UK
53．If you go to the UK，you can know the air qualityB．
A．on the Internet
B．over the phone
C．on TV
54．Each family has nearly two cars inA
A．Tokyo
B．London
C．New York
55．Which of the following is NOT true according to the information above？C
A．Beijing，Tianjin，Shandong and Wuhan have taken action to test air quality．
B．In Japan，people use the white towel to test tail gas．
C．In the US，people use red to show PM 2.5is dangerous．

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