9. Li Bai was one of the greatest poets, while Zhang Heng was one of the most famous Chinese a________ in the world.

8. The waste gas from the factory is h________ to our health.

7. Knowing that he failed to pass the exam, he felt very d________ and unhappy.

6. With the d________ of economy, people’s living standard is better and better now.

5. Water ________ (存在) in three forms, which are liquid, gas and solid.

4. The earth is one of the nine p________ which go around the sun.

3. Oceans cover two thirds of the s________ of the earth while land covers one third of it.

2. As a middle school student, you may find you are growing up ________ (渐渐地).

IV、根据中文或首字母提示，填写所缺单词的适当形式。 (10%)

1. To work out this problem, we have tried many m________.

D

Colour helps you see things. But man and some monkeys and apes (猿) are the only mammals that can see colour. To any other mammal, such as the dog, the world looks like a black-and-white photo. Dogs hunt mainly by listening and sniffing (闻).

Like other animals, dogs see best when things move, The animals they hunt seem to know this. A hunted rabbit or deer will “freeze”. Then the dog may not see it at all.

Birds can see colour. They need to, because they fly and need to find places to land. Colour helps them judge distance and shape. In this way they are able to catch bugs (昆虫) in the air or to light on branches.

Some birds see things even better than you do. The birds that eat bugs can see them from far away. And even a very young bird can see a hawk high in the sky. So sharp eyes and a sense of colour help birds find food and also help them find where their enemies are.

46. ______ can see colour.

A. All the animals　　　　　　　　　　　 B. All the mammals　　　

C. Man and dogs　　　　　　　　　　　　 D. Birds and monkeys

47. In order to find their food, dogs mainly use their ______.

A. eyes and noses 　　　　　　　　　　　　　　　　　　 B. ears and noses

C. eyes and ears　　　　　　　　　　　　　　　　　　　　 D. mouths and ears

48. The word “freeze” in the passage means ______.

A.　 the hunted animals are frozen on the ground because of cold weather

B. the hunted animals’ temperature is becoming lower and lower until it drops below 0℃

C. the hunted animals will stop running and stay in the same place without movement

D. the hunted animals are so frightened that they can’t move any longer

　　 49. Colour helps birds ______.

A.　　 see better than man 　　　　　　　　　　　　　　　　　 B. see better than dogs

C. see how colourful the world is 　　　　　　　　　　 D. see clearly where food and enemies are