Passage ThreeTrees 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. Pruning is usually clone in winter, for then you can see the shape of the tree clearly without the interference from the leaves.41. According to the article, which of the following statement is NOT true?

A block that can be opened at the hook or shackle end to receive a bight of the line is a（）.

In a charter-party，where there is a conflict between the printed and written parts of the contract owing to an error or to inadvertence，the intention expressed by the written part should，as a general rule，（）that expressed by the printed part.

It is the responsibility of the Master or person in charge of a ship to ensure that（）.

It is the responsibility of the Master or person in charge of a ship to ensure that（）.

The important thing is that this is a major breakthrough. “breakthrough” here means an important development or achievement.

 ______ twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city.

24． The reason why most plants can’t grow on the sandy beach is that

The Shipowner must not stow goods on deck（）there is a trade usage to that effect or the Charterer has given his express or implied consent.

There is a growing realization that the only effective way to achieve further reductions in vehicle（）is to replace conventional diesel fuel and gasoline with cleaner-burning fuels.

The ocean bottom that extends from the shoreline out to an area where there is a marked change in slope to a greater depth is the（）.

If the scavenge fire is of a more major nature, if there is a risk of the fire extending or if the scavenge trunk is adjacent to the crankcase with risk of a hot spot developing it sometimes becomes necessary to （）the engine.