更多"Since rainforest bacteria and trees"的相关试题:
[填空题]Since rainforest bacteria and trees depend on cacti other for life, the relationship they form is termed______.
[单项选择]What happens to trees each year
A. Their tings get thinner and thinner.
B. They add a ring of wood.
C. Their rings get darker in color.
D. They become more valuable.
[单项选择]Since the earliest times, trees have always been very useful and important to man who made use of them in numerous (众多的) ways for his daily life. Even today trees continue to serve man in so many useful ways.
Trees provide man with food, fuel for burning and building material in the form of wood. Without trees it would be impossible to build houses, boats and even bridges. Furniture such as tables, chairs and cupboards are also made from wood.
In the tropics (热带) where it is very warm throughout the year, trees protect man from the fierce heat of the sun. They are useful in preventing good and fertile top soil from being washed away during heavy rains which are so common in the tropics.
If there are no trees or vegetation (植物) of some sort to hold back the soil with their roots, heavy rains would wash away the rich surface soil so essential for agriculture. The result is that the land becomes useless and unproductive.
There are many desert areas in the world. A long
A. early man did not know how to make use of trees
B. trees are not as useful now as they were in the past
C. trees were more useful in the past than they are now
D. men have always found trees useful
[单项选择]Some trees are cut down each year and ______ are left to grow even taller.
A. the rest
B. a rest
C. rest of them
D. a rest of them
[单项选择]He______two thousand trees since 2001.
[A] planted [B] has planted [C] will plant
[单项选择]They are well ()with each other since they once studied in the same university.
A. identified
B. recognized
C. acknowledged
D. acquainted
[单项选择]
Healthy trees are important to us all. Trees provide shade, beauty, and homes for wildlife. Trees give us products like paper and wood. Trees can give us all these only if they are healthy. They must be well cared for to remain healthy.
Your trees’ trouble may be you yourself. People spend much time and money to plant and maintain trees. Trees improve the looks of homes, parks, business, and public buildings. Yet, people who love trees the most may be the ones who cause them injury. Of course, they do not do this on purpose. They are most likely not aware of the kinds of things that injure trees. There are many people-caused tree injuries. You should become aware of them and avoid them. Learn the things that can help to keep your trees healthy.
Healthy trees are beautiful. They make our world a pleasant place to live ill. Unhealthy trees are not as beautiful. They make our world less pleasant. Healthy trees help to cool and clean the air. They can even deade
A. beautiful
B. old
C. healthy
D. young
[填空题]The bacteria depend on worms for hydrogen sulfide in the symbiotic relationship.
[单项选择]
Passage 4
The texture of the soil depends on the
relative amounts of different-sized particles that combine to make up the soil.
These particles can be as large as stone and gravel or as small as
clay. A typical clay soil is composed of approximately 60
percent actual clay, 20 percent silt, and 20 percent sand. The particles in a
sandy soil are so fine that it tends to be compact and interferes with the
oxygen supply for plant roots. Water has trouble entering this impervious soil,
and runoff is very common during rainfalls. A typical light
sandy soil is composed of approximately 70 percent sand, 20 percent silt, and 10
percent clay. The particles in a sandy soil are comparatively large, permitting
water to enter the soil and to pass through it so quickly that it often carries
nutrients with it and dries out very rapidly. The texture of A. other clay soils retain less water B. other clay soils have smaller particles C. adobe soil has had organic material added to it D. adobe soil is found mostly in dry climates
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