|because of ,for example,come up,make use of,at present|
In the beginning,more than 4. 6 billion years ago, the world was a ball of burning gas, going round and round through space. At first,hot gases were a-ble to escape into outer space, but as the Earth cooled,they were held by gravity to fonn the early atmosphere. Clouds began to develop as water vapour collected in the air. . . And then it began to pour with rain, causing the early oceans to rise up.
It took hundreds of millions of years for the first land masses to appear. About 250 million years ago,long,long after the Earth had formed, all the continents of the time had joined together to form a super—continent called Pangaea.
This super—continent broke up about 200 million years ago to form two giant continents , Gondwana and Laurasia. Gondwana was made up of what is now Africa,South America, Australia, Antarctica and India. The Indian sub—conti-nent lay off the east coast of Africa , before it broke off and moved north rapidly.
It collided(碰撞)with Asia,creating one of the world’s greatest mountain ranges,which extends for more than 2,400 kilometres—the Himalayas. By now,our world had started to look like something we would recognize. The amazing process of plate tectonics(板块构造)n which the Earth's land masses move slowly across the Earth’s crust(外壳)is still continuing. Far in the future, some scientists have predicted that the present continents will join again, to form a new super—continent. Only time will tell.
1.With the Earth cooling,hot gases around the Earth formed .
2.Which of the following is TRUE according to the passage?
A.About 250 million years ago the Earth formed
B.At first the Earth was made up of two giant continents
C.The early Earth had only one continent called Pangaea
D.The Indian sub-continent formed before Gondwana
3.The underlined word "it" probably refers to .
C.the east coast of Africa
D.the Indian sub-continent
4.The passage is mainly about .
A.the development of the atmosphere
B.the development of the Earth
C.how the Himalayas formed
D.what a new super—continent is