题目内容：

阅读表达  阅读短文，回答问题。

Smog is one of the hot subjects these years. It is bad to people's health. The most terrible smog lasted for about a week in February， 2014. It covered 15 percent of the land in northern and central China.

Now， more and more people in China have realized the importance of protecting the environment. They try to save energy by walking or riding to work in their daily life. Cities including Beijing and Shanghai have taken action by reducing the number of cars and closing heavily polluting factories.

Beijing is heavily polluted， so it's not easy to see blue skies there. But during the APEC summit (亚太经合会议峰会）in November last year， Beijing saw blue skies for a few days. People happily call the "APEC blue”. "I hope the APEC blue will last， and I believe it will， because China have taken action to reduce pollution." said President Xi Jinping.

The two large countries， China and the USA， produce about 45 percent of the world's greenhouse gases(温室气体）On November 12， Presidents Xi Jinping and Obama announced(宣布) that both countries would work together to cut down CO2 emissions（二氧化碳的排放）．The goal needs everyone's effort.

回答下面5个问题，每题答案不超过6个词．

1.How long did the most terrible smog in China in February， 2014?

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2.How do more and more Chinese people help save energy in their daily life?

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3.Why is it difficult for Beijing to see blue skies?

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4.When was the APEC summit held in Beijing?

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5.What would China and the USA work together to do?

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