I. Read the passage and choose the best answer A, B, C or D to complete the passage.
The natural environment includes all natural resources that are necessary for life: the air, the oceans, the sun, andthe land. Because they are vital for life, these resources must be protected from pollution and conserved. Ecologists study their importance and how to (1).......... them carefully.
According to ecologists, resources are divided into two groups: (2).......... and non-renewable. When a resource is used, it takes some time to replaceit. If the resource can be replaced (3)........., it is called renewable. If it cannot be replaced quickly and easily, it is non-renewable. For example, grass for animals is a renewable resource. When cows eat the grass, the resource is used. If the soil is fertilized and (4).........., more grass will grow. Coal, however, is non-renewable because it takes millions of years to make coal. All fossil fuels are non-renewable resources.
1. A. use B. be used C. used D. using
2. non-renewable B. renewable C. limited D. plentiful
3. A. easy B. difficultly C. quickly D. for a long time
4. A. protect B. protected C. protecting D. to protect
I. Read the passage and choose the best answer A, B, C or D to complete the passage.
The natural environment includes all natural resources that are necessary for life: the air, the oceans, the sun, andthe land. Because they are vital for life, these resources must be protected from pollution and conserved. Ecologists study their importance and how to (1).......... them carefully.
According to ecologists, resources are divided into two groups: (2).......... and non-renewable. When a resource is used, it takes some time to replaceit. If the resource can be replaced (3)........., it is called renewable. If it cannot be replaced quickly and easily, it is non-renewable. For example, grass for animals is a renewable resource. When cows eat the grass, the resource is used. If the soil is fertilized and (4).........., more grass will grow. Coal, however, is non-renewable because it takes millions of years to make coal. All fossil fuels are non-renewable resources.
1. A. use B. be used C. used D. using
2. non-renewable B. renewable C. limited D. plentiful
3. A. easy B. difficultly C. quickly D. for a long time
4. A. protect B. protected C. protecting D. to protect