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Unit 2 Exercise 1
(建议用时：15分钟)
阅读理解
A
People can’t survive without food.Long ago, early people couldn’t grow crops, so they had to live by hunting animals and gathering grains.After a tribe(部落) had lived in an area for some time, its food supply would begin to reduce.Then the tribe had to move to new hunting grounds where there was more food.
This way of life caused special problems for the tribes.They were forced to depend on luck, as well as on their hunting skills.If they could find no game,_the whole tribe would be in danger of starving.And when the hunters had good luck one day, they were not sure to find game the next time.The tribes moved often because much land was needed to support their people.
As time passed by, people learned that they could grow their food.At first, the women of tribes collected patches of wild grain.Later, people discovered that they could plant their own seeds.Farming slowly became a way of life.
As people turned away from hunting to farming，their life changed.When the food supply became richer and richer, they no longer moved from place to place.The success of their crops depended partly on the weather, but there were also things they could do to help crops grow.
In the past, a tribe had to travel many miles for food.Now, only a small amount of land was necessary to feed the whole tribe.The early tribe could grow in size because farming provided a way to feed people.
[语篇解读] 人要生存就离不开食物，我们的祖先最初是靠种植来获取食物吗？阅读本篇了解一下种植是如何成为人类一种生存方式的。
1．Why did the early tribes move so often?
A．They enjoyed traveling around.
B．They had to find enough food.
C．Because of the bad weather they did not like to stay in one place.
D．They liked to go hunting everywhere.
解析：细节理解题。根据第一段第三、四句“After a tribe had lived in an area for some time，its food supply would begin to reduce.Then the tribe had to move to new hunting grounds where there was more food.”可知，答案为B。
答案：B
2．The underlined word “game” in Paragraph 2 probably means “________” in Chinese.
A．游戏 B．比赛
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C．野味 D．赌博
解析：词义猜测题。根据第二段第二、三句“They were forced to depend on luck，as well as on their hunting skills.If they could find no game，the whole tribe would be in danger of starving.”可知，他们主要靠幸运活下来，如果找不到野味(猎物)，整个部落会处于饿死的危险境地。由前面hunting便知答案为C。
答案：C
3．When farming provided enough food to people，________.
A．the women didn’t do any work at all
B．the tribe could grow larger and life became steady
C．they did not move at all
D．they no longer went hunting
解析：细节理解题。根据文章最后一句“The early tribe could grow in size because farming provided a way to feed people.”便知B项内容正确。
答案：B
4．From the passage we can infer that ________.
A．early tribes liked moving from place to place
B．hunting was interesting in early days
C．the change from hunting to farming happened very quickly
D．life was hard and unsteady for early tribes
解析：推理判断题。从第一段中得知，“一个部落在某一地区居住一段时间后，食物量不断减少，该部落不得不搬到有更多食物的地方”；从第二段中得知，“他们主要靠幸运活下来，如果找不到野味(猎物)，整个部落会处于饿死的危险境地”，因此对早期的种族来说，生活是艰辛的，不稳定的。
答案：D
B
Scientists are trying to make the deserts into good land again. They want to bring water to the deserts, so people can live and grow food.They are learning a lot about the deserts.But more and more earth is becoming deserts all the time.Scientists may not be able to change the deserts.Scientists think that people make deserts.People are doing bad things to the earth.
Some places on the earth don’t get very much rain.But they still don’t become deserts.This is because some green plants are growing there. Small green plants and grass are very helpful to dry places.Plants don’t let the hot sun make the earth even drier.Plants don’t let the wind blow the earth away.When a little bit of rain falls，the plants hold the water.Without plants, the land can become a desert much more easily.
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[语篇解读] 由于土地沙漠化，农田面积在减少，如何使沙漠变良田，植被作用至关重要，科学家们正在为此努力。
5．Small green plants are very important to dry places because ________.
A．they don’t let the sun make the earth even drier
B．they don’t let the wind blow the earth away
C．they hold the water
D．all of the above
解析：细节理解题。由原文第二段内容可知，A、B、C三项均可，所以选择D项。all of the above表示“以上所有的(选项)”。
答案：D
6．Land is becoming deserts little by little because __________.
A．plants can’t grow there
B．there is not enough rain
C．people don’t do what scientists wish them to do
D．scientists know little about the deserts
解析：推理判断题。阅读第一段可知，只有C项符合现实。
答案：C
7．Which is the main idea of the first paragraph?
A．Scientists know how to change deserts into good land.
B．Land is becoming deserts faster than scientists can change it back into good land.
C．If scientists can bring water to deserts, people can live and grow food there.
D．More and more places are becoming deserts all the time.
解析：段落大意题。由第一段和现实可知，土地沙漠化的速度要比科学家尽力使沙漠变良田的速度快，B项概括完整。其他三个选项都很片面，不能概括整个段落的含义。
答案：B
8．After reading this passage, we learn that ________.
A．plants can keep dry land from becoming deserts
B．it is good to get rid of the grass in the deserts
C．all places without much rain will become deserts
D．it is better to grow crops on dry land than to grow grass
解析：推理判断题。由文章可知，植被对控制土地沙漠化起主要的作用，A项正确。其他三个选项不符合文意。
答案：A
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