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We do everything possible to keep our kids safe. But what do you do if the air they breathe is hurting them? Two new studies have found an association between relatively low levels of air pollution and children's risk of autism spectrum disorder(ASD).

One study studied 132,000 births in Canada from 2004 to 2009. Researchers concluded there was a link between exposure to oxide from car exhaust during pregnancy and greater incidence of childhood ASD.

The second study observed more than 15,000 infants born in Denmark between 1989 and 2013. It found that air pollution exposure during the first months of life and later was also associated with ASD. While it's a small increase if large populations are exposed, it could affect many children.

"It confirms some previous research and suggests that an association between autism and air pollution should be studied again," Lynn Singer told Healthline. However, neither study proved that air pollution is causing ASD. The researchers have only found that children in an area with air pollution are at greater risk. This study's findings actually tell us we should try our best to protect our environment and to protect ourselves.

1.What did the two new studies show?

A There is no link between air pollution and children’s risk of ASD.

B There is an association between air pollution and children’s risk of ASD.

C Air pollution surely causes the children’s getting ASD.

D Air pollution will never cause the children’s getting ASD.

解析：选B。细节理解题。根据第一段第三句The two studies have found an association between relatively low levels of air pollution and children’s risk of autism spectrum disorder. 可知两项新研究发现：相对较低的空气污染与儿童患自闭症谱系障碍的风险之间存在关联，故选B。

2.What does the underlined word “exposure” mean in Chinese?

A 沐浴.

B 享受.

C 暴露.

D 排放.

解析：选C。词义猜测题。根据第二段第二句car exhaust 汽车尾气可知，应该是暴露在汽车尾气排放一氧化氮的环境，exposure意为“暴露”，故选C。

3.Which of the following is NOT true according to the passage?

A One study studied 132,000 births in Canada from 1989 to 2013.

B The second study observed more than 15,000 infants born in Denmark.

C If large populations are exposed to air pollution, it could affect many children.

D Both study proved that air pollution may be causing ASD.

解析：选A。细节理解题。根据第二段第一句One study studied 132,000 births in Canada from 2004 to 2009. 可知是研究了从2004年至2009年出生在加拿大的13.2万名新生儿，而不是1989年至2013，故选A。

4.Where can we read the passage?

A In a novel.

B On a health website.

C In a fashion magazine.

D In a story book.

解析：选B。推理判断题。文章讲述了空气污染与自闭症之间的关系，和健康有关，故选B。