Thereisgoodandbadnewsaboutthenumberoftreesonourplanet.T...

问题详情：

There is good and bad news about the number of trees on our planet. The good news is that there are seven times more trees than we thought. A few years ago, scientists believed that the world had 400 billion trees. However, a new study from Yale University shows that there are around three trillion(万亿) trees. That is a three followed by 12 zeros. That means there are about 420 trees for everyone in the world today.

The bad news is that thousands of years ago, the earth had six trillion(万亿) trees. Humans cut in half the number of trees on the planet. Take Europe for example, it was a large forest thousands of years ago. Now much of it is cities and towns. And another 15 billion trees are lost each year.

 Dr. Thomas Crowther is one of the scientists from YaleUniversity. He said the new number of trees from their study would change nothing. “The study only shows we need to do more to protect(保护) our forests,” he said.

21. The passage is about a study of __________ in the world.

A. the kind of trees.                                     B. the number of trees.   

C. the kind of animals.                                  D. the number of animals.

22. In the past, we thought everyone had about __________ trees.

A. 400.    B. 60            C. 12.             D. 420.

23. What can we learn from Dr. Thomas Crowther?

A. We still have enough trees to cut down.   B. We can find more trees in the future.

C. We should stop cutting trees down now.    D. We should do more to protect forests.

【回答】

BBD

知识点：阅读理解

题型：阅读理解