四、阅读表达。
All living things need energy to live and grow. This energy comes first from the sun. Plants use water and sunlight to make their own food. Animals cannot make their own food, and they eat plants. Other animals then eat the plant eaters.
A food chain shows what eats what. It might show that zebras eat grass and then lions eat zebras. Lions also eat other animals. Zebras eat other kinds of plants. So it takes more than one food chain to show how lions and zebras get their energy.

A food web shows how food chains work together. From it we can see how energy moves from plants to animals.
Plants and animals that live in hot, dry deserts depend on water as well as food. Creosote bushes have small leaves that hold water. Their seeds provide food and water for kangaroo rats. Kangaroo rats don't need to drink water. They get all the water they need from the plants they eat. Kangaroo rats keep cool by coming out only at night to look for food. Ring-tailed cats also come out only at night. Ring-tailed cats hunt and eat kangaroo rats. Coyotes eat both the kangaroo rats and the ring-tailed cats.
Nothing is wasted in a food web. Vultures(秃鹫) eat dead animals. Vultures are scavengers(食腐动物). Scavengers do not hunt and kill other animals to get food. They eat animals that are already dead. When a ring-tailed cat or a coyote dies, it makes a meal for the vultures. Scavengers do an important job in keeping the environment clean.
阅读以上短文，回答下列问题。每题答案不超过10个单词。
1. How do plants make their own food?
______
2. What is a food web?
______
3. Where do kangaroo rats get the water they need?
______
4. What kind of animal can go to the empty box in the picture?
______

By using water and sunlight.
; It shows how food chains work together.
; From the plants they eat.
; Vulture.