The ground search for the woman has been ______.

A.street

B.ollective

C.search

D.ground

A.trees

B.bushes

C.seeds

D.minerals

A.touch

B.ollective

C.search

D.ground

n 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 ,"This ground should be searched for metal. " From an airplane over a hilly wasteland a scientist sent back by radio one word: "Uranium. " None of the scientists had X-ray eyes: they had no magic power 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.., trees and plants as signs that certain minerals may lie beneath the ground on which the trees and plants are growing. This newest method of searching for minerals is based on the fact that minerals deep in the earth may affect the kind of bushes and trees that grow in the surface. At Watson Bar Greek, a brook(小溪) 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 trunks had more gold than those growing on the ends of the branches. Scientists were flying over a desert or a hilly wasteland or a mountain area in order to search for __________ in the ground.

A.gold

B.silver

C.uranium

D.minerals

n 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 ,"This ground should be searched for metal. " From an airplane over a hilly wasteland a scientist sent back by radio one word: "Uranium. " None of the scientists had X-ray eyes: they had no magic power 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.., trees and plants as signs that certain minerals may lie beneath the ground on which the trees and plants are growing. This newest method of searching for minerals is based on the fact that minerals deep in the earth may affect the kind of bushes and trees that grow in the surface. At Watson Bar Greek, a brook(小溪) 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 trunks had more gold than those growing on the ends of the branches. Scientists were flying over a desert or a hilly wasteland or a mountain area in order to search for __________ in the ground.

A.gold

B.silver

C.uranium

D.minerals

l other plants put the sun's energy to work for them combining the nutrients of ground and air into body structure, the chlorophylless fungus must look elsewhere for an energy supply. It finds it in those other plants which, having received their energy free from the sun, relinquish it at some point in their cycle either to other animals (like us humans) or to fungi.

In this search for energy the fungus has become the earth' s major source of rot and decay. Wherever you see mold forming on a piece of bread, or a pile of leaves turning to compost, or a blown-down tree becoming pulp on the ground, you are watching a fungus eating. Without fungus action the earth would be piled high with the dead plant life of past centuries. In fact, certain plants which contain resins that are toxic to fungi will last indefinitely. Specimens of the redwood, for instance, can still be found resting on the forest floor centuries after having been blown down.

The title below that best expresses the main idea of this passage is ______.

A．Life without Chlorophyl

B．The Source of Rot and Decay

C．The Harmul Qualities of Fungi

D．The Strange World of the Fungus

l other plants put the sun's energy to work for them combining the nutrients of ground and air into body structure, the chlorophylless fungus must look elsewhere for an energy supply. It finds it in those other plants which, having received their energy free from the sun, relinquish it at some point in their cycle either to other animals (like us humans) or to fungi.

In this search for energy the fungus has become the earth's major source of rot and decay. Wherever you see mold forming on a piece of bread, or a pile of leaves turning to compost, or a blown-down tree becoming pulp on the ground, you are watching a fungus eating. Without fungus action the earth would be piled high with the dead plant life of past centuries. In fact, certain plants which contain resins that are toxic to fungi will last indefinitely. Specimens of the redwood, for instance, can still be found resting on the forest floor centuries after having been blown down.

The title below that best expresses the main idea of this passage is ______.

A．Life without Chlorophyl

B．The Source of Rot and Decay

C．The Harmul Qualities of Fungi

D．The Strange World of the Fungus

val Air Station at Fort Lauderdale, Fla., on a 【C1】______ training mission over the Atlantic Ocean. Less than two hours later, the flight commander 【C2】______ that he was "completely lost." Then there was silence. A 【C3】______ plane was sent to search for the missing aircraft and it, too, disappeared. In all, six planes and 27 men 【C4】______ that day without a trace. Despite one of history's most 【C5】______ search efforts, Involving more than 300 planes and dozens of ships, the Navy was unable to 【C6】______ even floating wreckage or a telltale oil slick.

This is just one of the many chilling stories told of "The Bermuda Triangle". During the past 30 years, the triangle has 【C7】______ the lives of some 1000 seamen and pilots. 【C8】______ sailors, it is known variously as "The Triangle of Death," "The Hoodoo Sea" and "The Graveyard of the Atlantic" because of the mysterious calms, waterspouts, and sudden storms that have 【C9】______ seafarers in its water.

The triangle has 【C10】______ considerable public interest through three 【C11】______ books, a television documentary (narrated by horror master Vincent Price) and a special exposition at the Library of Congress. None of these investigations has produced 【C12】______ answers to the mystery of the triangle, but there is no 【C13】______ of interesting theories. Some scientists and popular authors go 【C14】______ suggest that triangle is the 【C15】______ ground of extraterrestrial beings in search of human specimens for their "cosmic zoos."

【C1】

A．normal

B．routine

C．ordinary

D．regular

rch of reality. Science can not really explain electricity, magnetism, and gravitation; their effects can be measured and predicted, but of their nature no more is known to the modem scientist than to Thales who first speculated on the electrification of amber. Most contemporary physicists reject the notion that man can ever discover what these mysterious forces "really" are. Electricity, Bertrand Russell says, "is not a thing, like St. Paul's Cathedral; it is a way in which things behave. When we have told how things behave, when they are electrified, we have told all there is to tell." Until recently scientists would have disapproved of such an idea. Aristotle, for example, whose natural science dominated Western thought for two thousand years, believed that man could arrive at an understanding of reality by reasoning from self-evident principles. He felt, for example, that it is a self-evident principle that everything in the universe has its proper place, hence one can conclude that objects fall to the ground because that is where they belong, and smoking goes up because that is where it belongs. The goal of Aristotelian science was to explain why things happen. Modem science was born when Galileo began trying to explain how things happen and thus originated the method of con- trolled experiment which now forms the basis of scientific investigation.

The aim of controlled scientific experiments is ______.

A．to explain why things happen

B．to explain how things happen

C．to describe self-evident principles

D．to support Aristotelian science

aves and red feathers to make an offering to the spirit who had caused the sickness of my little sister. It had been a long, hard winter, and the snow lay deep on the grassland as far as the eye could reach. The medicine-woman's directions had been that the offering must be laid upon the naked earth, and that to find it I must face toward the setting sun.

But now where was a spot of earth to be found in all that white monotony？ They had talked of death at the house. I hoped that my little sister would live, but I was afraid of nature.

I reached a little spring. I looked down to its bottom, wondering whether I should leave my offering there, or keep on in search of a spot of earth. If I put my offering in the water, would it reach the bottom and touch the earth, or would it float away, as it had always done when I made my offering to the water spirit？

Once more I started on in my search of the bare ground.

The surface was crusted in some places, and walking was easy; in other places I would wade through a foot or more of snow. Often I paused, thinking to clear the snow away in some place and there lay my offering. But no, my faith must be in nature, and I must trust to it to lay bare the earth. It was a hard struggle for so small a child.

I went on and on; the reeds were waving in the wind. I stopped and looked at them. A reed, whirling in the wind, had formed a space round its stem, making a loose socket. I stood looking into the opening. The reed must be rooted in the ground, and the hole must follow the stem to the earth. If I poured my offerings into the hole, surely they must reach the ground; so I said the prayer that l had been taught, and dropped my tobacco and red feathers into the opening that nature itself had created.

No sooner was the sacrifice accomplished than a feeling of doubt and fear thrilled me. What if my offering should never reach the earth？ Would my little sister die？

Not till I turned homeward did I realize how cold I was. When at last I reached the house they took me in and warmed me, but did not question me, and I said nothing. Everyone was sad, for the little one had grown worse.

The next day the medicine-woman said my little sister was beyond hope; she could not live. Then bitter remorse was mine, for I thought I had been unfaithful, and therefore my little sister was to be called to the spirit land. I was a silent child, and did not utter my feelings; my remorse was intense.

The phrase "white monotony" (Paragraph 2) refers to the fact that

A．white people find farm life dull.

B．snow covers the landscape.

C．the narrator is blind.

D．nothing special happens in the story.