四、信息还原
Do you know what a landform is? We use landforms to describe(描述)the earth's surface, such as a mountain, or an ocean. Landforms are shaped by wind, water and ice. Human activities, such as farming, mining(采矿), building, and pollution(污染), can change landforms.
1.
G
For example, people can plant trees to protect the land and build homes for animals. People can also build dams(水坝)to create(创建)lakes for water and power using.
But some human activities can hurt the landforms and are bad for the environment(环境) and people's life. 2.
E
Cities take away animals' homes and make it harder for plants to grow. Then floods may happen. Farming is another way people hurt the environment. Using too many chemicals and not watering in a smart way can make the environment worse. 3.
C
People need lots of things from the earth, but mining can hurt the land.
So we should protect the landforms. Landforms are important. They give us natural resources(资源). They also influence(影响)the weather of different areas. 4.
D
We can protect the landforms by using them wisely. We can cut down our use of natural resources. We can also recycle and reuse materials to produce less waste and pollution. Another way is to build things like parks and forests, 5.
F
By protecting the landforms, we are not only protecting the earth's beauty, but also our own future.
A. but we can do nothing about it.
B. Landscapes were amazing things in the past.
C. Mining is the third way people hurt landforms.
D. Besides, they also give us beautiful landscapes.
E. For example, people cut down forests for new buildings.
F. and use them to help stop floods and give animals home.
G. Some human activities can change the landforms in positive(积极的)ways.