持有反对意见。故选D。

4．What's the main idea of the text?

A．Causes of climate change. 　　　

B．Effects of greenhouse gases.

C．Explorations on climate change.

D．Findings about global warming.

【答案】　C　主旨大意题。根据全文内容得知本文主要讲述了科学家们对气候变化的众多探索。故选C。

B

(2019·安阳模拟)You might think that "global warming" means nothing more than a rise in the world's temperature. But，rising sea levels caused by it have resulted in the first evacuation (撤离) of an island nation-the citizens of Tuvalu will have to leave their homeland.

During the 20th century，sea level rose 8-12 inches. As a result，Tuvalu has experienced lowland flooding of salt water which has polluted the country's drinking water.

Paani Laupepa，a Tuvaluan government official，reported to the Earth Policy Institute that the nation suffered an unusually high number of fierce storms in the past ten years. Many scientists connect higher surface water temperatures resulting from global warming to greater and more damaging storms.

Laupepa expressed dissatisfaction with the United States for refusing to sign the Kyoto Protocol，an international agreement calling for industrialized nations to reduce their greenhouse gas emissions，which are a main cause of global warming. "By refusing to sign the agreements the US has effectively taken away the freedom of future generations of Tuvaluans to live where their forefathers have lived for thousands of years，" Laupepa told the BBC.

Tuvalu has asked Australia and New Zealand to allow the gradual move of its people to both countries，Tuvalu is not the only country that is vulnerable (易受影