Passage One

In many countries today, laws protect wildlife. In India the need for such protection was realized centuries ago.
About 300 B. C. an Indian writer described forests that were somewhat like national parks today. The killing of game animals was carefully governed. Some animals were fully protected. Within the forest, nobody was allowed to cut trees, burn wood, or trap animals for their furs. Animals that became dangerous to human visitors were trapped or killed outside the park, so that other animals would not become uneasy.
The need for wildlife protection is greater now than ever before. About a thousand sorts of animals are in danger of extinction, and the speed at which they are being destroyed has been putting on. With mammals, for example, the speed of extinction is now about one sort every year; from A. D. 1 to 1800, the speed was about one sort ever), fifty years. Everywhere, men are trying to solve the problem of saving wildlife while caring for the world’s growing population.

The word" extinetion"in this report most properly means“（）”.

A:falling down B:dying out C:growing up D:going away

It takes a long time to grow a tree. How long Well, pine trees are the quickest growing trees, but still, they take twenty years to reach a size suitable for cutting and harvesting. An oak takes about sixty years to grow to a good size. A redwood may take hundreds of years.
Lumber companies, which make their money on trees, depend on those that grow quickly. Therefore, they are always looking for methods to make trees grow faster. So far, the secret to fast growing trees seems to lie in "super-seeds." These are seeds that are gathered from the quickest growing trees in a forest. One company searched 100,000 acres of trees and selected the seeds from just fifteen trees. These two ounces of seed were enough to plant several hundred new trees. Eventually, when these trees have grown, seeds will again be taken only from the fastest growing trees of crop. This process of artificial selection will yield, in the future, a super-tree that will grow in half the time it takes normal trees to develop.
Unfortunately, it takes a long time for a plan like this to reach its goal. The Weyerhauser Lumber Corporation, which started its first collection of seed in 1958, is just now beginning to harvest the super-seeds of the first generation of the faster growing trees.

Trees that grow faster are developed by（　）

A:planting many trees and fertilizing them B:collecting seeds from strong, slow growing trees C:selecting the seeds of the fastest growing trees D:feeding them high-energy plant foods

It takes a long time to grow a tree. How long Well, pine trees are the quickest growing trees, but still, they take twenty years to reach a size suitable for cutting and harvesting. An oak takes about sixty years to grow to a good size. A redwood may take hundreds of years.
Lumber companies, which make their money on trees, depend on those that grow quickly. There- fore, they are always looking for methods to make trees grow faster. So far, the secret to fast growing trees seems to lie in "super-seeds." These are seeds that are gathered from the quickest growing trees in a forest. One company searched 100,000 acres of trees and selected the seeds from just fifteen trees. These two ounces of seed were enough to plant several hundred new trees. Eventually, when these trees have grown, seeds will again be taken only from the fastest growing trees of crop. This process of artificial selection will yield, in the future, a super-tree that will grow in half the time it takes normal trees to develop.
Unfortunately, it takes a long time for a plan like this to reach its goal. The Weyerhauser Lumber Corporation, which started its first collection of seed in 1958, is just now beginning to harvest the super-seeds of the first generation of the faster growing trees.
Trees that grow faster are developed by ______.

A:planting many trees and fertilizing them B:collecting seeds from strong, slow growing trees C:selecting the seeds of the fastest growing trees D:feeding them high-energy plant foods

It takes a long time to grow a tree. How long Well, pine trees are the quickest growing trees, but still, they take twenty years to reach a size suitable for cutting and harvesting. An oak takes about sixty years to grow to a good size. A redwood may take hundreds of years.
Lumber companies, which make their money on trees, depend on those that grow quickly. There- fore, they are always looking for methods to make trees grow faster. So far, the secret to fast growing trees seems to lie in "super-seeds." These are seeds that are gathered from the quickest growing trees in a forest. One company searched 100,000 acres of trees and selected the seeds from just fifteen trees. These two ounces of seed were enough to plant several hundred new trees. Eventually, when these trees have grown, seeds will again be taken only from the fastest growing trees of crop. This process of artificial selection will yield, in the future, a super-tree that will grow in half the time it takes normal trees to develop.
Unfortunately, it takes a long time for a plan like this to reach its goal. The Weyerhauser Lumber Corporation, which started its first collection of seed in 1958, is just now beginning to harvest the super-seeds of the first generation of the faster growing trees.

Trees that grow faster are developed by（　）

A:planting many trees and fertilizing them B:collecting seeds from strong, slow growing trees C:selecting the seeds of the fastest growing trees D:feeding them high-energy plant foods

NASA can tell that vegetation is growing back because of ______.

A:a bright, white light that is reflected B:little tiny trees that are growing C:vegetable gardens that are planted D:a light, pinkish view from space

Passage 2
Flying over a desert area in an airplane,two scientists looked down with trained eyes at trees and bushes,After an hour's flight one of the scientists wrote in his book,“Look here for probable metal.”Scientists in another airplane,flying over a mountain area,sent a message to other scientists on the ground,“Gold possible.”Walking across hilly ground,four scientists reported.“The ground should be searched for metal.”From an airplane over a hilly wasteland a scientist sent there by radio one word:“Uranium.” None of the scientists had X ray eyes:they had on magic powers of looking down below the earth's surface.They were merely putting to use one of the newest methods of locating minerals in the ground,using trees and plants as signs that certain minerals may lie beneath the ground on which trees and plants are growing. This newest method of searchng for minerals is based on the fact that minerals deep in the earth may affect the kind of bushes and trees that grow on the surface. At Weston Bar Greek,a brook six thousand feet high in the mountains of British Columbia,Canada,a mineral search group gathered bags of tree seeds.Boxes were filled with small branches from the trees.Roots were dug and put into boxes.Each bag and box was carefully marked.In a scientific laboratory the parts of the forest trees were burned to ashes and tested.Each small part was examined to learn whether there were minerals in it. Study of the roots,branches,and seeds showed no silver.But there were small amounts of gold in the roots and a little less gold in the branches and seeds.The seeds growing nearest to the tree trunk had more gold than those growing on the ends of the branches.

The study of trees, branches and roots shows that （）.

A:larger amounts of gold in the branches than in the seeds B:smaller amounts of gold in the roots than in the branches C:less amounts of gold in the seeds growing on the ends of branches than seeds growing nearest to the tree trunk D:there was more gold in the branches than in the roots

Passage 2
Flying over a desert area in an airplane,two scientists looked down with trained eyes at trees and bushes,After an hour's flight one of the scientists wrote in his book,“Look here for probable metal.”Scientists in another airplane,flying over a mountain area,sent a message to other scientists on the ground,“Gold possible.”Walking across hilly ground,four scientists reported.“The ground should be searched for metal.”From an airplane over a hilly wasteland a scientist sent there by radio one word:“Uranium.” None of the scientists had X ray eyes:they had on magic powers of looking down below the earth's surface.They were merely putting to use one of the newest methods of locating minerals in the ground,using trees and plants as signs that certain minerals may lie beneath the ground on which trees and plants are growing. This newest method of searchng for minerals is based on the fact that minerals deep in the earth may affect the kind of bushes and trees that grow on the surface. At Weston Bar Greek,a brook six thousand feet high in the mountains of British Columbia,Canada,a mineral search group gathered bags of tree seeds.Boxes were filled with small branches from the trees.Roots were dug and put into boxes.Each bag and box was carefully marked.In a scientific laboratory the parts of the forest trees were burned to ashes and tested.Each small part was examined to learn whether there were minerals in it. Study of the roots,branches,and seeds showed no silver.But there were small amounts of gold in the roots and a little less gold in the branches and seeds.The seeds growing nearest to the tree trunk had more gold than those growing on the ends of the branches.

The study of trees, branches and roots shows that （）.

A:larger amounts of gold in the branches than in the seeds B:smaller amounts of gold in the roots than in the branches C:less amounts of gold in the seeds growing on the ends of branches than seeds growing nearest to the tree trunk D:there was more gold in the branches than in the roots

Passage 2
Flying over a desert area in an airplane,two scientists looked down with trained eyes at trees and bushes,After an hour's flight one of the scientists wrote in his book,“Look here for probable metal.”Scientists in another airplane,flying over a mountain area,sent a message to other scientists on the ground,“Gold possible.”Walking across hilly ground,four scientists reported.“The ground should be searched for metal.”From an airplane over a hilly wasteland a scientist sent there by radio one word:“Uranium.” None of the scientists had X ray eyes:they had on magic powers of looking down below the earth's surface.They were merely putting to use one of the newest methods of locating minerals in the ground,using trees and plants as signs that certain minerals may lie beneath the ground on which trees and plants are growing. This newest method of searchng for minerals is based on the fact that minerals deep in the earth may affect the kind of bushes and trees that grow on the surface. At Weston Bar Greek,a brook six thousand feet high in the mountains of British Columbia,Canada,a mineral search group gathered bags of tree seeds.Boxes were filled with small branches from the trees.Roots were dug and put into boxes.Each bag and box was carefully marked.In a scientific laboratory the parts of the forest trees were burned to ashes and tested.Each small part was examined to learn whether there were minerals in it. Study of the roots,branches,and seeds showed no silver.But there were small amounts of gold in the roots and a little less gold in the branches and seeds.The seeds growing nearest to the tree trunk had more gold than those growing on the ends of the branches.

The study of trees, branches and roots shows that （）.

A:larger amounts of gold in the branches than in the seeds B:smaller amounts of gold in the roots than in the branches C:less amounts of gold in the seeds growing on the ends of branches than seeds growing nearest to the tree trunk D:there was more gold in the branches than in the roots