Unit 4 Astronomy the science of the stars 语言点（教师版）

Book3 Unit 4 学案 Warming upLanguage points【原句 1】In our solar ________ eight planets circle around the sun. 在我们的太阳系中有八颗行星围绕着太阳转。1). ____________ n.[c] 系统；体系；制度；方法 _______________ adj 有系统的; 有条理的Eg: He introduced us a well-designed railway system. The economic system affects the whole countries.Under the new system, people love our country..(1) The ______ ______ (教育系统) operates very differently in the US and China.(2)太阳系包括太阳和它的八颗行星。_______________________________________________________________________________(3) 在新制度下，农民工(migrant workers)将受益很多。_______________________________systematic educational system The solar system includes the sun and its eight planets.Under the new system, migrant workers will benefit a lot. Reading一．语法填空（根据课文内容完成短文） No one knows how the earth began, as it happened so long ago. However, according to a 1._______(wide) accepted theory, the universe began 2. ______ a "Big Bang" that threw matter in all directions. After that, atoms began to form and combine to create stars and other bodies. For several years after the "Big Bang", the earth was still just a cloud of dust. What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe. The earth became so violent 3. ______it was not clear whether the shape would last or not. It exploded loudly with fire and rock. They were in time to produce carbon, nitrogen, water vapour and other gases, 4._______ were to make the earth's atmosphere. 5.______ is even more important is that as the earth cooled low, water began 6._________ (appear) on its surface. Water had also appeared on other planets like Mars but, 7.____...