单项选择题

Question 23 is based on the following news. At the end of the news item, you will be given 5 seconds to answer the question. Now, listen to the news.
How many cities will have air quality monitoring systems installed by the end of this year（）

A．42 cities.
B．220 cities.
C．150 cities.
D．262 cities.

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A．They set foot in Florida.
B．They were drowned.
C．They were flown to the U.S.
D．They were sent back to Cuba.

Question 23 is based on the following news. At the end of the news item, you will be given 5 seconds to answer the question. Now, listen to the news. How many cities will have air quality monitoring systems installed by the end of this year（） 您的浏览器不支持 audio 元素。