households.
The darkening Nexleaf filters also gave a clear
warning sign to Indian women about the health danger
of their regular cooking stoves. When they saw the junk
they were breathing in, they were all asking for our
cleanerburning cooking stoves.
【语篇解读】 加利福尼亚州的人们现在可以用他们的手机来测量自己所处的位置的空气的污染程度了。
1.The underlined word“this”in Paragraph 3 refers to________.
A.sending emails to an online database
B.tracking levels of harmful black soot
C.taking a picture of air in workplaces
D.absorbing black soot in the air
解析 代词指代题。根据第一段中的“track levels of harmful black soot”可知,第一段讲的是利用手机来获取空气的污染程度,第二段讲到一个带有照相机的普通手机就可以为空气的污染程度拍照,接着第三段讲到,我们不需要昂贵的装置来获取有关空气的污染程度的信息,下文讲到了原因以及其体的操作流程。
答案 B
2.Why were cellphone users asked to collect information on black soot?
A.To collect data for scientists to make research.
B.To pay attention to its role in changing climate.
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