题目内容：

阅读理解。

PM2.5--Killer in China    10:00 a.m.  April 1st,2014

Rank of Air Pollution	City	AQI	PM2.5 μg/m3	PM10 μg/m3	SO2 μg/m3	NO2 μg/m3	CO μg/m3	O3 μg/m3
2	Sanya	24	13	21	1	10	/	36
95	Shanghai	72	52	71	13	48	1.1	96
178	Harbin	78	45	78	38	43	/	54
259	Beijing	233	184	201	32	72	1.5	41
261	Tangshan	281	231	327	132	99	4.1	53

0--50	Excellent	Take part in activities &breathe fresh air
51--100	Good	Take part in activities
101--150	Light pollution	Have outdoor activities less
151--200	Middle pollution	Have outdoor activities less
201--300	Heavy pollution	Stop outdoor activities
>300	Serious pollution	Mustn’t go outside

AQI

 

 

 

 

 

 

 

 

PM2.5细颗粒物。PM10可吸入颗粒。AQI空气质量指数。

PM2.5（单位：μg/m3）表示每立方米空气中可入肺颗粒物的含量。

根据表格所提供的信息选择最佳答案。

1.The AQI in Beijing is much __________ than that in Sanya.

A. better                B. worse            C. bad

2.The air in ___________ is both heavy pollution.

A. Shanghai and Beijing

B. Beijing and Tangshan

C. Tangshan and Harbin

3.If you are in Tangshan, you had better _________.

A. have outdoor activities

B. breathe fresh air

C. stay at home

4.The amount of _______in the air in Sanya is the same as that in Harbin.

A. SO2                   B. O3                 C. CO

5.Which of the following is not TRUE according to the information above?

A. The air in Harbin is middle pollution, we’d better not go out to work.

B. We can know the AQI of April 1st from the table.

C. O3 in Shanghai is the most of all the cities.