2．Which of the following statements is TRUE according to the passage?

　　A．Greenhouse gases have been proven to harm merely the Earth.

　　B．There is little we can do to prevent global warming.

　　C．Global warming can increase the chances of droughts and floods.

　　D．The hugeness of oceans makes them better absorbers of heat than the air.

　　答案：C　细节理解题。由第五段第三句话“This changes the patterns of storms and rainfall in many regions and can lead to droughts and floods.”可知，C项正确。

　　3．The rise in global temperatures between 1901 and 2017 ______.

　　A．is more harmful to smaller creatures than bigger ones

　　B．is not serious because most of the extra heat has been absorbed by the oceans

　　C．has made the Earth's ecosystems more sensitive to changes

　　D．is likely to cause many species to become extinct

　　答案：D　细节理解题。由第四段最后一句话“It often starts with the smallest creatures at the bottom of the food chain, eventually affecting bigger animals, many of which could end up becoming extinct.”可知，D项正确。

　　4．What is Michel Jarraud's attitude toward the report released by the UN?

　　A．Negative.

　　B．Supportive.

　　C．Doubtful.

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