高一必修三unit4课件.ppt

* 英语·必修3(人教版) Reading 一 1．From Paragraph 1 we can know that stars are created from________． A．air　 B．atoms　 C．rocks　 D．ice B 一、根据课文“How life began on the earth”，选择正确答案。 2．What does the word “they” refer to in the sentences “It exploded loudly with fire and rock.They were in time to produce carbon, nitrogen，water vapour and...” in Paragraph 2? A．Planets. B．Stars. C．Gases. D．Fire and rock. D 3．Which is the right order of the development of life? A．Small clever animals—shellfish—dinosaurs—mammals. B．Shellfish—dinosaurs—small clever animals—mammals. C．Shellfish—dinosaurs—mammals—small clever animals. D．Dinosaurs—shellfish—mammals—small clever animals. C 4．Why were mammals different from other life forms? A．They gave birth to young baby animals and produced milk to feed them. B．They produced young generally by laying eggs. C．They were able to live on land as well as in the water. D．They live on grass. A 5．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. B 四、短文填空。 No one knows exactly 1.________the earth began. According to a widely accepted theory, the earth began with a “Big Bang”,2.________exploded loudly and produced water vapour and many gases,3.________(make) the earths atmosphere. As the earth cooled down, water appeared and stayed 4.________the surface. It was the presence of water 5.________allowed the earth to dissolve harmful gases and acids into the oceans and seas, which made 6.________possible for life to develop. First, the appearance of small plants encouraged the development of early shellfish and all sorts of fish. Next, green plants began to grow on land.7.________were followed by land animals.So reptiles appeared for the first time. Later, dinosaurs developed.8.________， they suddenly disappeared.After that, mammals came into being. Finally, humans appeared and spread all over the earth. However, they