题目内容
（请给出正确答案）
A、hydrophytes
B、xerophytes
C、respiration
D、transpiration
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（由简答题聘请的专业题库老师提供的解答）
更多“Dependent on limited soil moisture and rainfall, __________ can adapt to drought and cope”相关的问题
B．arbitrary
C．vulnerable
D．literary
Threes are useful to man in three very important ways: they provide him wood and other products; they give him shade; and they help to prevent drought (干旱) and floods. Unfortunately, in many parts of the world, man bas not realized that the third of these services is the most important. In his eagerness to draw quick profit from the trees, he has cut them down in large numbers. Two thousand years ago, a rich and powerful country cut down its trees to build warships, with which to gain itself an empire. It gained the empire but, without its trees, its soil became bare and poor. When the empire fell to pieced, the country found itself faced by floods and starvation. Even where a government realizes the importance of a plentiful supply of trees, it is difficult sometimes to make the people realize this. They cut down the trees but are too careless to plant and look after new trees. So, unless the government has a good system of control, or can educate the people, the forests slowly disappear. This does not only mean that there will be fewer trees. The results are even more serious: for where there are trees, their roots break the soil up, allowing the rain to sink in, and also bind the soil. This prevents the soil from being washed away. But where there are no trees, the rain falls on hard ground and flows away on the surface, and this causes floods and the rain carries away the rich topsoil in which crops grow. When all the topsoil is gone, nothing remains but worthless desert. Trees are useful to man mainly in three ways, the most important of which is that they can __________ . A. Keep him from the hot sunshine
B. enable him to build warships
C. make him draw quick profit from them
D. protect him from droughts and floods
It’s a great pity that __________ .A.man is only interested in building empires
B.man is eager to profit from trees
C.man hasn’t realized the importance of trees to him
D.man hasn’t found out that he has lost all trees
Sooner or later the forests will disappear __________ .A.unless a country has a plenty supply of trees
B.unless people stop cutting down their trees
C.unless all people are taught the importance of planting trees
D.unless the government punishes those who cut trees instead of planting them
When there is a heavy rain, trees can help to prevent floods, as they can __________ .A.keep rain from falling down to soft ground
B.cause the soil to allow rainwater to sink in
C.prevent the soil from being washed away
D.make the topsoil stick together
The word “bind” in Paragraph 5 means “__________”.A.to wash away
B.to make wet
C.to make stay together
D.to improve
| 阅读理解。 |
| Trees are useful to man in three important ways: they give him wood and other useful things, they give him cool places, and they help to stop drought and flood. Unluckily, in many parts of the world, man has not found that the third of these points is the most important. Man wants to make money from trees,so he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And also, he is usually too careless to plant and look after new trees. So the forests slowly disappear. This does not only mean that man will have fewer trees. The results are even worse: for where there are trees, their roots break up soil-make the rain in-and also bind the soil, thus stopping it from being washed away easily; but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When all the top-soil is gone, nothing is left but useless desert. |
| 1. The most important points of trees to man is _____. |
[ ] |
| A. they help him to make money B. they give him cool C. they give him wood and other things D. they help him to stop drought and floods |
| 2. In many places forests slowly disappear because _____. |
[ ] |
| A. many trees have been cut down by man B. new trees are not well looked after C. man has not paid enough attention to planting trees D. all the above |
| 3. Land becomes desert after all trees are cut down because _____. |
[ ] |
| A. roots of trees break up the soil B. there are too many rainfalls C. strong winds bring a lot of sand D. there are no longer trees to keep the rain and protect the top-soil. |
| 4. Which title best fits the passage？ |
[ ] |
| A. Trees and Man B.The Function of Tree Wood C. How do People deal with Trees？ D. The Usage of Tree Roots |
| The inside surface is resistant to water, so the coat can be____when it rains. |
[ ] |
| A. deserved B. reversed C. reserved D. preserved |
A、adj. →v.
B、v. →n.
C、v. →adv.
D、prep. →adv.
Droplets and ice crystals behave somewhat like dust in the air made visible in a shaft(束) of sunlight. To the casual observer, dust seems to act in a totally random fashion, moving about wildly without fixed direction. But in fact dust particles are much larger than water droplets and they finally fall. The cloud droplet of average size is only 1/2,500 inch in diameter. (78)It is so small that it would take sixteen hours to fall half a mile in perfectly still air, and it does not fall out of moving air at all. Only when the droplet grows to a diameter of 1/125 inch or larger can it fall form. the cloud. The average raindrop contains a million times as much water as a tiny cloud droplet. The growth of a cloud droplet to a size large enough to fall out is the cause of rain.
What is the main topic of the passage?
A．The mechanics of rain.
B．The climate of North America.
C．How gravity affects air current.
D．Types of clouds.
A、Hydrophyte
B、Phytochemistry
C、Xerophyte
D、Respiration
A、photosynthesis
B、phytochemistry
C、respiration
D、transpiration
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