unit4 astronomy课文阅读

T ask 1 Match each paragraph with its main idea.

1. Para1 A. The importance of water for life.

2. Para2 B. The development of plants and

animals on the earth.

3. Para3 C. The formation of the earth.

4. Para4 D. A widely theory about the

formation of the universe.

5. Para5 E. The arrival of humans and their

impact on the earth.

T ask 2 Choose the best answer

1. Why was the earth different from the other planets?

A. Because it produced a lot of heat.

B. Because the water remained.

C. Because the water disappeared.

D. Because it was the oldest planet.

2. Why was life able to develop on the earth but not on other planets?

A. The earth had a solid shape.

B. The earth did not have harmful gases in its atmosphere.

C. The water stayed on the earth but not on other planets.

D. The earth was not too hot and too cold.

3. Why was it necessary for plants to grow before animals?

A. Animals needed plants to protect them from the sun.

B. Plants provide oxygen for animals to breathe.

C. Animals could hide from hunters in the forest.

D. It was easier for plants to grow.

4. It can be inferred from the text that_______.

A. after a “Big Bang”, what the dust was to become remained a mystery.

B. plants appeared before the animals.

C. plants multiplied and filled the oceans with oxygen

D. plants played an important part in the appearance of the animals.

5. What is the main idea of the passage?

A. The formation of the earth.

B. The arrival of human and their impact on the earth.

C. The development of plants and animals on the earth.

D. The origin of life on the earth.

T ask 3 Put the order of development of life into a timeline.

1. Insects and amphibians appeared.

2. Dinosaurs appeared.

3. The earth became a solid ball.

4. Small plants grew on the water.

5. Reptiles appeared.

6. Plants began to grow on dry land.

7. The earth was a cloud of dust.

8. Water appeared on the earth.

9. Shellfish and other fish appeared.

10. The universe began with a “Big Bang”

11. Clever animals with hands and feet appeared

12. Mammals appeared.

诊标：

After the “Big Bang”, the earth was just a cloud of dust. It exploded with the fire and rock, which _____1_____ produced water vapour and all kinds of gases, and formed the earth’s _____2_____.

As the earth _____3_____, water began to appear on its surface. Water staying on the earth allowed the earth to