Read the passage and mark A, B, C or D to indicate the correct answer to each of the questions.
The environment is everything that surrounds us: plants, animals, buildings, country, air, water--- everything that can affect us in any way. The environment of a town, with its buildings and its noise and smells, is a far cry from that of the countryside, with its fields and crops, its wild and domestic animals and its feeling of spaciousness. And the environment differs in different parts of the world.
Ecology is the science of how living things exist together and depend on each other and on the local environment. Where an environment is peaceful, the ecology of an area is in balance.
Man is a part of the environment and has done more to upset the ecology than any other living things. He has poisoned the atmosphere and polluted both land and water. He has wasted the earth’s natural resources with no thought for the future, and has thought out the cruel ways of killing his fellow men--- and every other sort of life at the same time.
Since man has done so much damage, it is up to man to try to put matters right--- if it is not already too late. If there is to be any solutions for our ills, that solutions lie in the hands of the young, and the sooner they start doing something about it, the better.
One of the main causes of the earth’s troubles is that the world is overpopulated and that this overpopulation is growing at an ever increasing speed. At the same time we are using up our natural resources at an ever increasing speed with no hope for replacing them.
For many years the earth has been unable to provide enough food for these rapidly growing populations and the position is gradually becoming worse since the areas that were once rich have turned into deserts.
Even at this moment many of the earth’s natural treasures are being destroyed, many valuable animals and plants are being killed off, and it is becoming increasingly difficult to grow enough food to prevent much of the earth’s population from hunger. The situation is getting out of hand. Time is running out. But with your help, we may be able to save ourselves. Who cares?
The word “He” in paragraph 3 refers to__________.




A.Living creature
B.The ecology
C.The environment
D.Man

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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.
The air above our head is becoming cleaner. A breath of fresh air has been running right round the planet for the past five years. The planet is apparently purging itself of pollution. Paul Novell of the University of Colorado, the co-author of a report on this phenomenon says, “It seems as if the planet's own cleaning service has suddenly got a new lease of life. Suddenly, there are a lot of changes going on up there”.
Estimates of the death toll from urban smog have been steadily rising, so the new cleaner trend could have significant consequences for life expectancy in cities as well as for the planet itself. The sudden and unexpected reversal of several decades of worsening pollution extends from the air in city streets to the remotest mid-Pacific Ocean and Antarctica.
Among the pollutants which have begun to disappear from the atmosphere are carbon monoxide, from car exhaust and burning rain forests, and methane from the guts of cattle, paddy fields, and gas fields. Even carbon dioxide, the main gas behind global warning, has fallen slightly.
There are two theories about why pollution is disappearing. First that there is less pollution to start with due to laws to cut down urban smogs and acid rain starting to have a global impact. Second, that the planet may be becoming more efficient at cleaning up.
The main planetary clean-up agent is a chemical called hydroxyl. It is present throughout the atmosphere in tiny quantities and removes most pollutants from the air by oxidizing them. The amount of hydroxyl in the air has fallen by a quarter in 1980s. Now it may be reviving for two reasons: ironically, because the ozone hole has expanded, letting in more ultraviolet radiation into the lower atmosphere, where it manufactures hydroxyl. Then the stricter controls on vehicle exhausts in America and Europe may have cut global carbon monoxide emissions, thereby allowing more hydroxyl to clean up other pollutants.
It can be inferred from the passage that the cleansing of the planet is _________.




A.inexplicable
B.predictable
C.surprising
D.confusing