Until 1983, Tillson Lake had been a lovely weekend and vacation place for many families. Then everything changed. During the Fourth of July weekend, residents woke up one morning to find that the lake had disappeared.
Some people didn’t believe what they were seeing. They looked again, but to their amazement they found they had been right the first time. The lake was simply no longer there. In its place was a muddy crater hollow, 30 feet deep. It was as if the lake had been a giant bathtub and someone had pulled the plug.
The lake’s owner, Joseph Unanue, did indeed pull the plug. That’s exactly what happened. The dam that held back the water to form the lake was falling apart, so government officials ordered him to repair it. They issued him a permit to lower the water level "five feet or more." He did much more. Mr. Unanue found that repairs to the dam would cost $ 100,000. He didn’t want to spend that much, so he opened the dam
A. have something to do with
B. lose one’s temper
C. pull the plug
D. complain about his action
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(四) 某厂为了提高质量检验的效率和效果，合理地配置检验资源，对本厂的产品质量检验系统、质量检验等各方面进行了更为规范的规划和分类。 |
Trees should only be pruned (修剪) when there is a good reason for doing so. Many gardeners believe that more damage results from doing it unnecessarily than from leaving the tree to grow in its own way.
First, pruning may be done to make sure that trees have a desired shape. The object may be to get a tree of the right height, and to help the growth of small side branches which will thicken its appearance or give it a special shape. Secondly, pruning may be done to make the tree healthier. You may cut out diseased or dead wood, or branches that are rubbing against each other and thus causing wounds. A tree may grow healthier by removing the branches that are locking up the centre and so preventing the free movement of air.
One result of pruning is that an open wound is left on the tree and this provides an easy entry (进入) for diseases, but it is a wound that will heal. Often there is a race between the healing and the disease as to whether the tree will live or die
A. to describe how pruning a tree is done
B. to discuss different ways of pruning trees
C. to give practical instructions for pruning a tree
D. to explain how a tree wound gets diseased and heals
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