In the past, man did not have to think about the protection of his environment.

题型：不详难度：来源：

In the past, man did not have to think about the protection of his environment. There were not many people on earth, and natural resources seemed to be unlimited.
Today, things are different. The world has become too crowded. We are using up our natural resources too quickly, and at the same time we are polluting our environment with dangerous chemicals. If we continue like this, human life on earth will not survive.
Everyone realizes today that if too many fish are taken from the sea, there will soon be none left. Yet, with modern fishing methods, more and more fish are caught. We know that if too many trees are cut down, forests will disappear and nothing will grow on the land. Yet, we continue to use bigger and more powerful machines to cut down more and more trees.
We realize that if rivers are polluted with waste products from factories, we will die. However, in most countries waste products are still put into rivers or into the sea, and there are few laws to stop this.
We know, too, that if the population of the world continues to rise at the present rate, in a few years, there will not be enough food.
What can we do to solve these problems?
If we eat more vegetables and less meat, we will easily get more food. Land that is used to grow crops can feed five times more people than land where animals are kept.
The world population will not rise so quickly if people use modern methods of birth control.
Finally, if we educate people to think about the problems, we shall have a better and cleaner living place in the future.

The importance of protecting the environment
Problems	◆ More fish being caught. ◆ More 小题1:     being cut down. ◆ More waste products being put into rivers. ◆ More小题2:     being born.
Causes	◆ The world is becoming too 小题3:     . ◆ Modern methods make the situation worse .
Result	We human beings will not survive on the earth.
Solutions	◆ Eat more vegetables and less meat so that more food will be available  for everyone. ◆ Use modern methods of 小题4:     control so that the population will not grow too fast. ◆ Educate people so that the 小题5:    will be better and cleaner.

   

答案

小题1:trees
小题1:babies
小题1:crowded
小题1:birth
小题1:earth

解析

小题1:根据We know that if too many trees are cut down,描述可知更多的数目被砍伐，故填：trees树木。
小题1:根据that if the population of the world continues to rise at the present rate,可知指的是更多的孩子出生，故填babies，婴儿。
小题1:根据The world has become too crowded.可知当今的世界变得越来越拥挤了，故填：crowded，拥挤的。
小题1:根据The world population will not rise so quickly if people use modern methods of birth control.描述，可知需要采取现代人口控制方法，故填：birth，出生。
小题1:根据Finally, if we educate people to think about the problems, we shall have a better and cleaner living place in the future.可知指的是教育人们，故填：earth，地球。