[单项选择]Once there is a threat to our water supply, water can quickly become the only thing that matters．（）
A. 只要水源受到威胁，水很快就会变成唯一重要的物质。
B. 供水一度出现危机，所以水很快就成了唯一紧缺的物质。
C. 供水一旦受到威胁，水很快就会成为唯一至关重要的问题。
D. 有一次水源曾遭受污染，水成了人们唯一不能很快解决的问题。

[单项选择]Once there is a threat to our water supply, water can quickly become the only thing that matters．
A. 只要水源受到威胁，水很快就会变成唯一重要的物质。
B. 供水一度出现危机，所以水很快就成了唯一紧缺的物质。
C. 供水一旦受到威胁，水很快就会成为唯一至关重要的问题。
D. 有一次水源曾遭受污染，水成了人们唯一不能很快解决的问题。

[单项选择]

Shrinking Water Supply Poses Threat to Peace

"Water, which is essential for life, costs nothing. On the other hand, diamonds, which are essential for nothing, cost a lot. " Unfortunately, the world has changed considerably since an 18th century economist made this remark.
What was true over 200 years ago is certainly no longer true now. In a number of countries people pay as much for water in their homes as they do for electricity.
Like health, we ignore water when we have it-unless there are floods, of course. Once there is a threat to our water supply, however, water can quickly become the only thing that matters. We know only too well that, without water, there can be no life.
The situation is now becoming so bad that environmentalists feel it many be necessary to shock the world into saving water in a similar way to the shock caused by the oil crises in the 1970’s.
At that time, the oil crisis became such
A. People now pay as much for water as they did 200 years ago.
B. People now pay as little for water as they did 200 years ago.
C. Water now costs as much as it used to.
D. Water now has become more expensive than it was.

[单项选择]Once our chickens started laying eggs, we had such a （　） of eggs that we were giving many away to our neighbors.
A. output
B. surplus
C. production
D. plenty

[单项选择]Air and water pollution are our Number One priorities regarding the current and future state of the environment．
A. 有关环境的现状和未来，空气和水污染是我们关注的首要问题。
B. 未来和现在的水污染和空气污染状况是我们关注的首要问题。
C. 由于空气和水污染，未来和现在的环境成了我们关注的首要问题。
D. 空气污染和水污染是未来和现在环境的头号杀手。

[单项选择]All （）is a steady supply of water to the farmland.
A. which needs
B. that is needed
C. the thing is needed
D. need

[单项选择]Once water pollution（） , it would be rather difficult to put it under control.
A. has done
B. does
C. did
D. is done

[单项选择]
How did the men get their water supply at the South Pole [A] They dug out clean snow. [B] They depended on ships to bring them water supply. [C] They depended on planes to bring them water supply.

[单项选择]D
European mink (豹) once lived well along waterways throughout most of Europe. The fur (皮毛) of this small animal is soft and beautiful. But some people believed the fur of the American mink was better. Fur farmers took thousands of American minks to eastern Europe, and they quickly developed throughout Europe. In the wild, American minks drove the other animals away from the best hunting grounds. Now just a few hundred European minks are left—making them Europe’s most endangered (濒危) wild life. To save the mink, scientists are trying to keep a certain number living on an island in Baltic Sea. Without help, says David Macdonal of Oxford University’s Wildlife Conservation Research Unit in England, the European mink is "heading for extinction (灭绝)./

Scientists think American mink has more useful fur.
A. Right.
B. Wrong
C. Doesn’t Say.

[单项选择]

We once had a poster competition in our fifth grade art class.
"You could win prizes," our teacher told us as she wrote the poster information on the blackboard. She passed out sheets of construction paper while continuing. "The first prize is ten dollars. You just have to make sure that the words on the blackboard appear somewhere on your poster. "
We studied the board critically. Some of us looked with one eye and held up certain colors against the blackboard rocking the sheets to the right or left while we conjured up our designs. Others twisted their hair around their fingers or chewed their erasers while deep in thought. We had plans for that ten- dollar grand prize, each and every one of us. I’m going to spend mine on candies one hopeful would announce while another practiced looking serious wise and rich.
Everyone in the class made a poster. Some of us used parts of those fancy paper napkins, while others used nothing but c
A. enjoyed grown up tricks very much
B. loved poster competitions very much
C. felt surprised to win the competition
D. became wise and rich after the competition