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Today, the forests have almost gone. People must ______ down too many trees.
A．stop from cutting
B．be stopped to cut
C．be stopped from cutting
答案
更多“Today, the forests have almost gone. People must ______ down too many trees.A．stop from cu”相关的问题
第1题
According to Werner Kurz, what are the forests in Canada like today？
A．They are a significant distortion.
B．They are changing to a new source.
C．They have been a carbon sink.
D．They have changed to a carbon source.
第2题
Today, about 5 million people visit Banff ______.
A．in spring
B．to see the valleys, mountains, forests and rivers
C．to stay in Banff Springs Hotel
D．to show off their wealth
第3题
A．Y
B．N
C．NG
第4题
The reason for the Americans' silence on their own lumber today is that ______.
A．they no longer exist
B．Americans apply a double standard
C．little lumber comes from federal land
D．private forests completely control the market
第5题
The author mentioned the energy crisis to show__________．
A.it is important to protect the forests
B.it is necessary to find substitutes for wood
C.why the Chinese changed their way of cooking
D.what problems a big population is causing China today
第6题
A map unveiled in March by the Washington-based World Resources Institute not only shows the locations of former forests, but also assesses the condition of today's forests worldwide. Institute researchers developed the map with the help of the World Conservation Monitoring Center, the World Wildlife Fund, and 90 forest experts from a variety of universities, government organizations, and environmental groups.
Only one-fifth of the remaining forests are still "frontier forests", defined as a relatively undisturbed natural forests large enough to support all of their native species. Frontier forests offer a number of benefits: They generate and maintain biodiversity, protect watersheds, prevent flooding and soil erosion, and stabilize climate.
Many large areas that have traditionally been classified as forest land don't qualify as "frontier" because of human influences such as fire suppression and a patchwork of logging. "There's surprisingly little intact forest left," says research associate Dirk Bryant, the principal author of the report that accompanies the new map.
In the report, Bryant, Daniel Nielsen, and Laura Tangley divide the world into four groups: 76 countries that have lost all of their frontier forest; 11 nations that are "on the edge"; 28 countries with "not much time"; and only eight—including Canada, Russia, and Brazil—that still have a "great opportunity" to keep most of their original forest. The United States is among the nations said to be mining out of time: In the lower 48 states, says Bryant, "only 1 percent of the forest that was once there as frontier forest qualifies today."
Logging poses the biggest single threat to remaining frontier forests. "Our results suggest that 70 percent of frontier forests under threat are threatened by logging," says Bryant. The practice of cutting timber also creates roads that cause erosion and open the forest to hunting, mining, firewood gathering, and land clearing for farms.
What can protect frontier forests？ The researchers recommend combining preservation with sustainable land use practices such as tourism and selective timber extraction. It's possible to restore frontiers," says Bryant, "but the cost and time required to do so would suggest that the smart approach is to husband the remaining frontier forest before it's gone.
What is the main idea of the passage？
A．The present situation of frontier forest on Earth.
B．The history of ecology.
C．The forest map in the past.
D．Beautiful forests in different parts of the world.
第7题
听力原文： Human beings are cutting down the world's rain forests at the rate of 20 hectares a minute (31) . Every year, 30 million hectares of rain forests are destroyed. And at this rate, most of the world's rain forests will disappear very soon.
The forests are cut down sometimes for wood, sometimes for farms so that crops and vegetables can be planted and sometimes to make way for roads. But the forests do not re-grow. The soil is very thin and it is soon washed away by the rain. The land is then too poor for the forests to begin to grow again.
There are a number of good reasons for saving the rainforests. Several important drugs in hospitals have come from the rain forests. Also they produce food. The rain forests are rich in wildlife, too. They cover less than 10% of the world's land, but they contain 40%～50%of the world's species of plants and animals (29) . The trees supply oxygen. If the rain forests are destroyed, this will change the world's weather (30) . Temperatures will go up, sea levels will rise and there will be changes in rain and snowfall.
Today, research studies in forests in Panama, New Guinea and Indonesia may help us to find solutions to save the world's rain forests.
(30)
A．15%.
B．10%.
C．About 50%.
D．Nearly 30%.
第8题
第9题
第10题
