Dinosaurs lived on Earth (A) more than 60 million years before human beings. B They lived everywhere on Earth. Some dinosaurs were as small as chickens. (C)       were as big as ten elephants. Some could even fly.

Many dinosaurs ate plants. (D)        , some dinosaurs liked to eat meat.

Dinosaurs lived on Earth for more than 150 million years. Then, suddenly, (E)他们都灭绝了。(F)NO one knows why. However, we can learn about them from their fossils.

Many people are looking for a pet that is a little more interesting than a cat or a dog. If you have a lot of space and are happy to find out how to look after it, a green iguana（蜥蜴）） can make a great pet. We spoke to Dr. Troy Wilson, a specialist in lizards, about how to look after an iguana.

The first question is, what should it live in?

Dr. Wilson: The green iguana can grow to be about 2 meters long, so you are going to need a big space to keep it in. Start with a small glass tank for a baby iguana, then when it is bigger, you can move it into a larger cage.

Do they need water?

Dr. Wilson: Yes. Iguanas need water to drink and sit in. In the wild they always live near water and they are good swimmers. They need a water dish or small pond that is big enough for them to sit in.

What do they eat?

Dr. Wilson: They eat mostly raw vegetables and some fruit. You can feed your iguana fresh vegetables every day and some fruit once a week. Iguanas cannot chew their food so you should cut it into the right size. They swallow food in one piece.

Are they fun?

Dr. Wilson: An Iguana is a clever, friendly animal. It will learn who you are and can even be quite affectionate. (深情的)