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Chinese experts claimed that smog(雾霾) can delay global warming because the particles floating in the air help oceans absorb CO2.

The smog was believed to do nothing aside from(除……之外) damaging people’s health and the ecosystem on the Earth, but this can be changed, Li Weijun, a professor at Shandong University, and Shi Zongbo, a researcher at the University of Birmingham, told the Science and Technology Daily on Monday.

Li said that scientists have believed for a long time that the acid(酸) produced by human activity and emissions can allow the iron oxide(氧化铁) which cannot get solved in the water to change into iron which can get solved in the water. If the particle settles on the surface of the ocean, it can allow the living things on the surface of the ocean to effectively use iron and encourage the growth of sea microorganism(微生物).

The process can store more CO2 in the ocean and delay the global warming process, said Li, adding that previously there was no evidence to prove that the acid substance helps iron oxide change into iron. However, scientists found products produced by steel factories and coal factories in the Yellow Sea region contain iron substances and are surrounded by sulfate(硫酸盐). The sulfate surface contains iron, which provides "solid evidence" for the theory.

1.What did people think of smog in the past?

A It could promote the growth of microorganism.

B It could harm people’s health and the ecosystem.

C It could help iron solved in the water.

D It could help the Yellow Sea become cleaner.

解析：选B。细节理解题。根据第二段第一句The smog was believed to do nothing aside from damaging people’s health and the ecosystem on the Earth... 可知过去人们认为雾霾除了对人的身体健康有害和破坏神态环境至外地，其他一无是处，故选B。

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

A 沉没.

B 解决.

C 溶解.

D 浸透.

解析：选C。词义猜测题。根据上下文可知“铁……水中、氧化铁不……水中”“鱼吸收利用……水中的铁”可知是溶解于水中，故选C。

3.How can smog delay the global warming?

A Raise the growth of the fish.

B Change iron oxide change into iron.

C Promote the producing of the factories.

D Store more CO2 in the ocean.

解析：选D。细节理解题。根据第三段第一句.The process can store more carbon dioxide in the ocean and delay the global warming process... 可知因为这个过程能够使二氧化碳储存于海洋之中，所以能够延缓全球变暖，故选D。

4.Why does the author mention the Yellow Sea?

A To prove smog also does good to the Earth.

B To prove smog helps to produce iron.

C To prove solid evidence for the change.

D To prove the close connection between factories.

解析：选A。推理判断题。根据第二段内容可知雾霾能够帮助氧化铁转变为铁，从而有益于地球，下面提到黄海周围的厂排放到的温室气体使得黄海周围的硫化物中含有铁可知提到黄海是想说雾霾也对地球有积极影响，故选A。