一、单项选择
() 1. —Sally, water, remember to turn off the tap when you brush your teeth.
—All right, Mum.

A.to save
B.saving
C.save
D.saved

() 2. —Look! There is a bird's nest in the tree. We must protect it.
—You're right. We should tell people not to trees. They are home to birds.

A.pick up
B.cut down
C.look after
D.cut in

() 3. Which of the following sentences can describe the picture?

A.The river is dirtier than before.
B.It shows smoke from factories.
C.Factories are putting waste into the river.
D.Some people drop litter in public places.

二、词汇运用
According to UNICEF, around 900 children in Africa fall ill every day for a (原因) that may be hard to imagine. The water they drink and use is (clean). Clean water is like a precious gift, yet people often (倾倒) chemicals into rivers and lakes without a second thought. The wastewater then pollutes the (土壤). As cities grow, we must turn to more (环保的) ways of living, otherwise, the environment will get worse quickly.
1. 2. 3. 4. 5.