题目内容：

    Like you and your pet dog, plants are living things: they eat, drink, and grow. Unlike you and your dog, they can't run away, use fists or teeth, or hide under the covers when they're threatened. But they can fight back.

Why would a plant need to fight back? To avoid being eaten, of course! Plants have several ways of protecting themselves. A plant can grow in a hidden or hard-to-get-to place. Think of plants you've seen growing on steep, rocky cliff (悬崖). Or, a plant could make only some parts of itself attractive to hungry insects and animals. For instance, if a plant produced really tasty leaves, herbivores (creatures that eat only plants) might eat the leaves instead of the seeds, which the plant needs for making more plants. Some plants have sharp or slippery (滑的) parts that discourage insects and other animals from getting too close, like the thorns(刺) on a rosebush.

But the most interesting way that plants fight back is by using chemicals. Plants take minerals from the soil and combine them into chemicals that do a lot of work. For example, plants produce chlorophyll(叶绿素), which helps convert sunshine and water into the sugars that plants eat.

They also produce chemicals to help protect themselves. One kind of tobacco plant releases a chemical into the air whenever small bugs begin to eat it. The chemical signals large bugs, saying "Dinner's ready!" The big bugs come to eat the little ones and save the plant.

Most plants use chemicals in a more direct way against their enemies. In other words, plants make poison.

1.What does the underlined word "convert" mean?

A.Change B.Separate

C.Form D.Produce

2.What do we know from the passage?

A.Some plants hide under the covers when faced with threat.

B.A plant grows in a hard-to-get-to place to draw people's attention.

C.Some plants produce tasty leaves to protect their seeds.

D.Plants produce chemicals to meet the needs of big bugs.

3.What may be talked about following the last paragraph?

A.Different effects that different plant poisons cause on plant eaters.

B.Different kinds of plants in the world.

C.Why plants make poison?

D.How to protect plants?

4.What would be the best title for the passage?

A.Plant information. B.Plant enemies.

C.Plant poisons. D.Plant protection.