题型：任务型阅读 题类：常考题 难易度：普通
四川省天府名校2020届高三上学期英语9月联合质量测评试卷
Is our planet heating up? Are human beings to blame for climate change? The discussion on this subject has been heated, but what are scientists actually saying? At Reader's Digest, we decided to find it out.
Yes, it has, and even warmer. Greenland was forested between 450,000 and 800,000 years ago, so temperatures were considerably warmer then. There have also been other times of relatively high temperatures.
So why does the concern exist?
It's all about the speed at which temperatures are changing. But in the 20th and 21st centuries, especially since 1976, temperatures have probably risen more quickly than during any century in the past 1 ,000 years. Warming may bring improved crop production and other benefits to northern countries such as Canada or Russia. However, many species may not adapt to these conditions, and the one that is able to may cause a problem. The West Nile virus, first seen in North America nine years ago, infected about 4,000 people in the US in 2006. The mountain pine beetle, which is active during warmer winters, has already destroyed about 13 million hectares of Canada's forests, worth an estimated $6. 4 billion.
What is causing the warming?
IPCC has concluded that human activity is very likely responsible, by increasing the concentrations of greenhouse gases and thus the greenhouse effect. They argue the human contribution is nothing.
A. Some scientists, however, still disagree.
B. Has the planet ever been this warm before?
C. Has human behavior made the planet warm?
D. Temperatures have been changing all the time.
E. In the past, temperatures moved up or down gradually.
F. Mosquitoes have been moving northwards to higher places.
G. These questions have burst into newspapers, films and popular books.
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