Unit4 Astronomy：the science of the stars NO_3__教师寄语：Never put off what you can do today until tomorrow.今日事今日毕！How life began on the earthⅠFast readingⅰ．What is the passage about?ⅱ．Put the order of development of life into a time line.A. Insects and amphibians appeared.B. The earth became a solid ball.C. Reptiles appeared.D. The earth was a cloud of dust.E. Shellfish and other fish appearedF. Dinosaurs appeared. G. Small plants grew on the water.H. Plants began to grow on dry land.I. Water appeared on the earth.J. Mammals (including humans )appeared.The right order:ⅲMultiple-choice1.Why was the earth different from other planets?A It produced a lot of heat. B.The water remained.C Water disappeared. D.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 not too cold.3.Why did the plants grow before animals came?A Animals needed plants to protect them from the sun. B Plants provided oxygen for animals to breathe.C Animals could hide from hunters in forest.D It was easier for plants to grow.4.What problem is caused by human beings?A They exist everywhere on the earth.B They cause global warming.C They find new methods of growing crops.D They enjoy hunting and fishing.Ⅱ.Close readingⅰRead the text and match the main idea of each paragraph.Parag raph 1: a. The importance of water for life 1Paragraph 2: b. The development of plants and animals on the earth Paragraph 3: c. The formation of the earth Paragraph 4: d. A widely accepted theory about the formation o...
