Unit 4 Astronomy: the science of the stars（Warming Up, Pre-reading and Reading）

b重點句子1.what it was to become was a mystery until the dust began to slowly combine into a ball moving around the sun. p252.it’s exploded loudly with fire and rock, which were in time to produce the water vapour, carbon dioxide, oxygen, nitrogen and other gases, which were to make the earth’s atmosphere. p253.it allowed the earth to dissolve harmful gases, which had become part of the earth’s atmosphere, into the oceans and seas. p254.whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved. p262. ability goals a. enable ss to talk about the science of the stars, the development of life and space travel and gravity where do we come from?how did the universe begin?why is the universe the way it was?how will it end?how much do you know about universe?do you want to have a space travel?do you know something about gravity?b. understand the text and answer the following questions:1.                                 what was there on the earth before life could begin?2.                                 why do scientists think there has never been life on the moon?3.                                 why did animals first appear in the seas?4.                                 why did green plants help life to develop?5.                                 why were mammals different from other animals?c. enable the ss to understand the details about the passage, choosing the correct answer according to the text and put the order of development of life into a time line and answer questions.d. retell the passage using key sentences.3. learning ability goals enable ss learn how to talk about the beginning of life on the earth.