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A technology company has made a new air cleaner for the home. The company is called Dyson. Its new air purifier(净化器) is called the Pure Cool Link. The purifier can clear away 99.95 percent of pollutants in the home. Pollutants are the things like dust, smells, chemicals and smoke. The new air purifier cleans the air in a room in an hour. It also checks the air quality to keep it at safe levels. This is great for people who have health problems. It can be linked to an app so that users can control it from anywhere in the world.

Pollution is a growing problem. Most of us think it is only a danger outside the home. James Dyson, boss of the Dyson company, said, “We think it is polluted outside of our homes, but the air inside can be far worse.” He explained why this can happen. He said, “Modern homes have been built to be more sealed(密封的) against noise and keep heat, which means the pollutants we make inside the home are also kept and build up to levels up to five times more polluted indoors than out.” The air purifier will be on sale for between $500 and $650.

1.Dyson made a new _______.

A washer

B air cleaner

C ice box

D air conditioner

解析：选B。细节理解题。根据第一段第一、二句A technology company has made a new air cleaner for the home. The company is called Dyson.可知，故选B。

2.The underlined word “pollutants” means _______ in Chinese.

A 废气

B 废渣

C 废物

D 污染物

解析：选D。词义猜测题。A、B、C三项所表述的概念与文中Pollutants are the things like dust, smells, chemicals and smoke.相比较太过狭窄，故选D。

3.How long will it take to clean a house with three rooms?

A An hour.

B Less than an hour.

C Two hours.

D Three hours.

解析：选D。数字计算题。根据第一段第六句The new air purifier cleans the air in a room in an hour.可知，故选D。

4.Modern homes are more sealed to _______.

A keep heat

B keep pollutants

C keep away thieves

D keep noise

解析：选A。细节理解题。根据第二段第五句Modern homes have been built to be more sealed against noise and keep heat,可知，故选A。

5.How much do you have to pay for a new purifier?

A $100-$150.

B $200-$250.

C $200-$250.

D $500-$650.

解析：选D。细节理解题。根据第二段最后一句The air purifier will be on sale for between $500 and $650.可知，故选D。