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极限真空(limiting vAcuum)(名词解释)
极限真空（limiting vAcuum)（名词解释)
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更多“ 极限真空(limiting vAcuum)(名词解释)”相关的问题
A.压力极限量与真空极限量和的百分数;
B.压力极限和精度等级百分数：
C.压力极限量与真空极限量，精度等级百分数之和
D.压力极限量与真空极限量之和，乘以精度等级百分数
Unlike some environmental issues, rain forest depletion has fortunately received significant public and media attention. Despite the opposition to the cutting down of rain forests, the problem continues. Every year, Brazil chops down on area of forest the size of the state of Nebraska. In addition to the Amazon's rain forests, many other forests are being cut down as well. In Indonesia, Zaire, Papua New Guinea, Malaysia, Burme, the Philippines peru, Colombia, Bolivia, and Venezuela, rain forests that were once great have been lost.
According to some estimates, 50 million acres of rain forest are cut down every year. The United Nations says the figure is closer to 17 million acres. The World Wildlife Fund says that every minute, 25 to 50 acres are cut or burned to the ground.
The world's growing population has been a primary reason of rain forest destruction. More people need land to live on and wood products to consume. Limiting population growth may be the first in a series of steps that would limit the destruction of the rain forests.
In the opinion of the author, ______ are being destroyed terribly at present.
A．the oceans
B．the atmosphere
C．the rain forests
D．all the above
