At times the balance in nature is ______，resu...

At times the balance in nature is____, resulting in a number of possibly unforeseen effects.

高一英语单项填空中等难度题查看答案及解析

At times the balance in nature is ______，resulting in a number of possibly unforeseen effects.

A．troubled  B．confused    C．disturbed  D．puzzled

高一英语单项填空中等难度题查看答案及解析

However, at times this balance in nature is ______, resulting in a number of unforeseen effects.

A. troubled　　 B. disturbed　 C. confused　 D. Puzzled

高一英语单项填空中等难度题查看答案及解析

When nature is left alone, a balance is reached among the animals and plants living in one area. But when man starts his work in nature, the balance is likely to be destroyed. He grows a crop and takes it away to eat ;then there are no dead leaves to fall on the ground, holding water while it sinks into the surface, or decaying (腐烂) and adding humus (腐殖质) to the soil. Unless a farmer acts with knowledge and skill, he is therefore most likely to make the land poorer. To take the place of the useful matter in the crops that he removes, he uses some kind of fertilizer (肥料). Chemical fertilizers are of great help, but the waste products of animals and decaying remains of plants should also be put on the land. In some places, it is a habit to burn waste material lying about, but such burning destroys the useful matter in the dead plants. Although the ashes that are left are valuable when put on the land, a better practice is to bury the waste so that it decays and increases the humus in the soil.

In the past, when the world population was much lower than it is now, a man had little difficulty in ordinary times in growing the food that was needed. When a field had been used some years and had become tired, the farmer could move to another place. The tired land then slowly recovered. By and by grasses and other plants would appear on it and its productive power would slowly return to normal through their decay. But nature, left alone, would take a long time to bring back the land to its former state; the length of time required would depend on local conditions, but it might well be ten years.

It is a bad practice to grow the same crop in a field year after year. If the crop is changed, the land will suffer less because it is treated and used in a different way. Different plants have different effects on the soil. Therefore, a change of crop will do less harm than the growing of the same crop year after year and a regular change to grass will do good to the soil. Much will therefore be gained if different crops are grown one after another, a method known as the rotation (轮作) of crops.

1.According to the passage, the land will become poorer (   )

A. if all the dead leaves are cleared away        B. if the humus is increased after the harvest

C. if dead leaves decay in the soil by themselves  D. if waste plant material lying about is buried

2.We can learn from the passage that the tired land has slowly recovered (   )

A. when grasses and other plants appear again

B. when the treatment is given by nature alone

C. after new grasses and other plants have decayed again

D. after nature has been left alone for several months

3.A modern farmer can hardly move to another place as he did before because (   )

A. the productive power of a new field isn't higher than that of an old one

B. there are few free fields left for him to do farming

C. it takes a farmer more than ten years to start farming in a new field

D. there will be too many grasses in a new field to grow crops

4.It is most likely that the author will go on to (   ) in the paragraph following the passage above.

A. introduce other methods of planting crops     B. deal with how to prevent land getting tired

C. start another topic of how to make use of land  D. further explain what the rotation of crops is

高一英语阅读理解简单题查看答案及解析

The disagreement between the two countries resulted in a war __________.

高一英语单项填空简单题查看答案及解析

If you keep on your research, you’ll find out the result _______.

A. in time        B. at no time           C. on time              D. at the same time

高一英语单项填空简单题查看答案及解析

Hiking is ____ great fun. You will get close to _____ nature and take exercise at the same time.

A. a; the    B. the; /    C. /; the    D. /; /

高一英语单项填空中等难度题查看答案及解析

Hiking is ______ great fun. You will get close to ______ nature and take exercise at the same time.

A. a; the            B. a; ／          C. ／; the      D. ／; ／

高一英语单项填空简单题查看答案及解析

Unluckily, not everyone has realized the important role the balance of nature _______ in their daily life.

A.makes B.plays C.acts D.does

高一英语单项填空中等难度题查看答案及解析

_______ at the amazing scenery in Shangri-la, she could hardly believe that it is created by nature.

A．Staring           B．Glancing          C．Glaring           D．Seeing

高一英语单项填空中等难度题查看答案及解析