Unit 3 Life in the future Language points课时作业

第一节　语法填空 根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

(2017·山西昔阳中学高二检测)

　　Over 80 percent of mankind's diet is provided by the seeds of less than a dozen plant species. But the amount and the variety of crop production have been increasing all the time.

　　_____1___For example，Egyptians settled along the River Nile，the Chinese empire along the Yellow River，and the Mesopotamian countries along the Tigris and Euphrates rivers. The river systems provided these early civilizations with a consistent source of silt(泥沙) from the yearly floods and water for the crops. ___2____

　　Farming changed very little from early times until about 1700. In the 1700s an agricultural revolution took place，which led to a large increase in the production of crops. ___3___These crops，such as corn and potatoes，produced very large yields.

　　In the 1850s，the industrial revolution came to the farm with new mechanized methods. ___4____Early on，the biggest changes were in the use of new farm tools. ___5____The new tools，combined with crop rotation(轮作)，manure(粪肥) and better soil preparation，led to a steady increase in crop yields in Europe. Later on，the arrival of steam power and，later，gasoline-powered engines represented a big step forward in the production of crops.

A.These methods greatly increased production rates.

B.So people had to work out a new plan to manage the water.

C.Many of the early civilizations began along major river systems.

D.Most of the early tools were still powered by horses，oxen or men.

E.Silt is like a natural fertilizer，bringing new minerals to enrich the soil.

F.How to increase the crop production has been a problem for human beings.

G.One great change in this revolution was the adoption of some different crops.

答案　1.C　2.E　3.G　4.A　5.D

第二节　(共20小题；每小题1.5分，满分30分)

　　阅读下面短文，从短文后各题所给的A、B、C和D四个选项中，选出可以填入空白处的最佳选项。

(2017·山西太原五中高二检测)

　　It was a hot Saturday at the community center. I sat in the chair，and closely watched my -___1____area. Suddenly，a little girl ___2____the water slide(水滑梯). I noticed her ___3______as under the water. Soon I was in the water with the girl in my arms.

The other lifeguards (救生员) congratulated me on my first ____4______.I thought back to