试题库在线考试题库-历年真题模拟试题及答案-考博英语在线试题测试中心-希赛网

北京航空航天大学

Email is a convenient, highly democratic informal medium for conveying messagesthat（）well to human needs.

There is much I enjoy about the changing seasons, but my favorite time is the （） from fall to winter.

The（）cycle of life and death is a subject of interest to scientists and philosophers alike.

Trees should only be pruned when there is a good and clear reason for doing so and, fortunately，the number of such reasons is small. Pruning involves the cutting away of overgrown and unwanted branches, and the inexperienced gardener can be encouraged by the thought 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 or size. The object may be to get a tree of the right height, and at the same time 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 diseased or dead wood, or branches that are rubbing against each other and thus cause wounds. The health of a tree may be encouraged by removing branches that are blocking 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 for disease, 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, so that there is a period when the tree is at risk. It should be the aim of every gardener to reduce that risk of death as far as possible. It is essential to make the area，which has been pruned, smooth and clean, for healing will be slowed down by roughness. You should allow the cut surface to dry for a few hours and then paint it with one of the substances available from garden shops produced especially for this purpose. Pruning is usually without interference from the leaves and also it is very unlikely that the cuts you make will bleed. If this does happen, it is, of course, impossible to paint them properly.1.Pruning should be done to（）.2.Trees become unhealthy if the gardener（）.3.Why is a special substance painted on the tree?4.A good gardener prunes a tree（）.5.What was the author’s purpose when writing this passage?

Of the thousands of different kinds of animals that exist in the world man has learned to make friends with an enormous number. Some are pets, which offer him companion- ship; some give protection, and some do hard work which man cannot do for himself. Dogs, which serve man in all three capacities, are found in various breeds in all countries of the world. The Husky can live in the cold polar regions, and the Saluki is at home in the hottest parts of Central Africa. The inhabitants of certain countries are dependent for their very lives on the camel. In the West Indies the little donkey, strong and sure-footed ,carrying heavy loads even in mountainous places,is a familiar sight.Trained and tamed for many generations, domestic animals are not accustomed to roa- ming in search of food and shelter. They look to their masters to provide for their needs, and as long as these are supplied, they are content to do what their masters require.All domestic animals need proper food. It must be suitable for them, sufficient in quantity，fresh and clean. Some people feed a pet dog or cat on odds and ends of table scraps, and then wonder why the animal seems listless and dull. The quantity of food de- pends on the size of the animal and the amount of exercise it takes. Overfeeding is as bad as underfeeding. Containers for food and water must be washed regularly if the animal is to maintain good health.Even well cared animals may sometimes fall ill. If this happens, the wise master seeks the best advice he can get. All sorts of medicines and treatments are available for sick ani- mals, and in some countries organizations exist to provide them free or at a cheap price. Useful, friendly，hardworking animals deserve to have some time，money and at- tention spent on their health.1.What main idea does the author want to convey in the first paragraph?2.When an animal is underfed, it will probably（）.3.Which of the following is NOT true of dogs according to the passage?4.To keep a domestic animal physically fit, its owner is advised（）.5.Which of the following would be best TITLE for this passage?

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