2020-2021学年高中英语人教版必修4语篇提能-8.docx

语 篇 提 能
阅读理解
A
If you want your land to keep fertile, you must try to stop soil from being carried away by water or winds. When soil is taken away by flowing water or blowing winds, we call it soil erosion. Ways have been found to stop soil erosion, and this is known as soil conservation. One way of stopping soil erosion is to grow small plants such as grasses. These plants are referred to as cover_crops,_whose roots hold the soil tightly together. The rain water cannot wash away the soil. When trees and tall bushes are planted at the edges of an open field, soil erosion by strong winds cannot take place. The trees and bushes, which act as a very big and firm wall, protect the open land from the winds. The way to stop soil erosion on slopes is to build terraces on the slope of hillside and mountainside. When the slope of a hillside is cut into “steps”， water carrying soil cannot run straight down the terraces, which are used to slow down the speed of the flowing water containing much soil in it. In this way most of the soil in the water is left behind on the terraces, much soil in it is kept.
语篇解读　本文是一篇说明文。目前，农业由于水土流失而大大受到影响。本文主要叙述了水土流失和防止水土流失的方法。
1．What takes place in soil erosion?
A. Flood happens to the fertile land.
B. A large quantity of earth wears away gradually.
C. Terraces are built on the slope of hillside or mountainside.
D. Plants are grown to protect the open land.
答案与解析　B　细节理解题。由“When soil is taken away by flowing water or blowing winds, we call it soil erosion.”可以得出答案。
2．The underlined phrase “cover crops” in this passage means ________.
A. grass roots
B. trees and bushes
C. plant life of an area
D. covering plants that produce grain or vegetables
答案与解析　C　词义猜想题。依据该短语所在的上下文，我们可以推断该短语的意思为“植被”。
3．Besides afforestation (植树造林), another method of fighting against soil erosion is to ________.
A. build terraces B. build walls
C. plant trees D. plant tall bushes
答案与解析　A　细节理解题。由“The way to stop soil erosion on slopes is to build terraces on the slope of hillside and mountainside.”可知答案。
4．Trees and tall bushes are planted around an open field ________.
A. because their roots hold soil tightly
B. to stop soil from being blown away by winds
C. because soil erosion causes terrible damage to crops
D. to keep the ecological balance
答案与解析　B　细节理解题。由“The trees and bushes, which act as a very big and firm wall, protect the open land from the winds.”可知答案。
B
Farmers can produce more by planting several different crops in the same field. But their success depends on which crops they plant together and how they mix (混合) them in the field. Until now, the only way the farmers could learn which crops grow best together was to plant them and wait for the results. Now however, a computer can give them answers. A new computer program written by Dr John Vanderwell of Michigan University can tell a farmer which plants grow well together and which do not. It can tell him how to plant the different crops; if he should plant each in a separate row, or mix the crops in the same row. It can tell the farmer how changes in planting each of the crops will affect the production of all of them. And it can tell him which plants can help reduce losses (损失) from diseases.
5．Which of the following best gives the main idea of the passage?
A. The computer program helps find the best program for mixing plants.
B. The computer program helps produce more crops.
C. The computer program helps protect against insects and diseases.
D. The computer program helps grow different plants.
答案与解析　B　由文中“Now however, ...”以后的内容可知，本文主要叙述计算机程序是如何来挂念农夫提高庄稼的产量。
6．According to the passage, to get the best result, one needs to choose carefully ________.
A. the kinds of crops to be planted together
B. the way for different crops to be mixed
C. both A and B
D. either A or B
答案与解析　C　此题是对短文中的第五、六两句的总结，只有做到选项A、B两项所说的两方面才能最大限度地提高产量。
7．It seems the new computer program can NOT tell us ________.
A. whether we should grow cotton and tomato together
B. how we should plant cotton and tomato together
C. what will happen if we grow potato instead of tomato，together with cotton
D. how we can grow rice in the fields which are intended for tomato
答案与解析　D　文中所提到的那种新的计算机程序只叙述了间作套种的问题，没有涉及D项的内容。
8．The new computer program seems most useful in saving us ________.
A. man power B. seeds
C. time D. land
答案与解析　D　文中叙述这种有关间作套种的新计算机程序能挂念农夫提高单位面积的产量。故D项正确。