题型:阅读选择 题类:常考题 难易度:普通
广东省佛山市顺德区2020-2021学年八年级下学期英语第7周教研联盟测试试卷
The water hyacinth(水葫芦) is one of the fastest growing water plants and it grows in many countries. It has beautiful purple-blue flowers but most people don't like it.
Millions of water hyacinths grow in rivers and lakes. Sometimes the plants become so thick that people can walk on them. People can't travel on boats on the water and they cannot fish in it. The plants also stop the water from moving. Then the water carries germs(细菌)that may make people and animals get ill. Farmers cannot use it to water their crops, either.
But now scientists think that water hyacinths can be useful. It is easy for these plants to grow. No one has to take care of them. They just grow and grow. So what can farmers use them to do? Some fish like to eat them. Farmers can grow these fish in the lakes and rivers with water hyacinths. Workers can collect and cut the plants with machines. Then they can use them to make their crops grow better. They can also feed their farm animals with them.
What's more, we know methane gas (沼气) can be made from plants. So it will be possible to make methane gas with water hyacinths. Then some poor countries will not have to buy the expensive petrol(石油).
Maybe in the future, people will love the water hyacinth instead of hating it.
①It grows very thick in rivers.
②It stops the water from running too fast.
③Farmers can feed their fish with it.
④It can be used to produce methane gas.
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