Unit 4  Astronomy: the science of the stars導學案

ⅰ.課文詞匯填空（旨在復習本課文中的單詞拼寫和主要詞語等）根據課文內容完成下面語法填空，注意單詞拼寫和詞語用法：     as the result of "big bang", the violent earth slowly settled into a globe    1   (move) around the sun. the gasses which were to make the earth's     2   （大氣層）came into being from the explosion of the dust ball, with water    3   (follow) them while the earth cooled down. it allowed the beginning for life. many millions of years    4   , the first    5   (極度的) small plants began to appear    6   the surface of the water,    7    (繁殖) and filling the sea and oceans, which encouraged the later development of early shellfish and all sorts of fish. as time passed, green plants taking carbon dioxide and producing   8  （氧氣）came to land and grew into forest. later the chains of lives continued, such as insects, amphibians, reptiles, dinosaurs and mammals, the typical of    9   is human being. they don't only do   10     to the earth but cause damage to it. 答案：1. moving 2. atmosphere  3.  following   4. later  5. extremely  6. on  7.  multiplying  8. oxygen   9. which  10.   good ⅱ.課文大意概括（旨在訓練用30個單詞概括大意的能力） 閱讀課文，試著用30來個單詞概括課文大意或將下面的短文譯成英語，    短文解釋了生命如何在地球上開始的。首先，地球爆炸和產生水。因為水的存在，然后植物和動物，包括人類逐漸在地球上出現。 ______________________________________________________________________________________________________________________________________________________________答案：the passage explains how life began on the earth. at first, the earth exploded and produced water. and then plants and animals including human beings appeared on the earth gradually because water exists on the earth. ⅲ.課文佳句背誦與仿寫（旨在培養對難句的理解和寫作能力）1【原句】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.  [模仿要點] 句子結構： what＋主語從句＋is … till +時間名詞＋定語從句【模仿1】他要給我什么禮物一直不知，直到昨天下文他來看我是我才知道。 __________________________________________________________________________________答案：what gift he would give me was uncertain until yesterday afternoon when he came to see us. 【模仿2】沒人知道我們將要得到什么樣的工作，直到3年后我們從大學畢業以后才知道。 __________________________________________________________________________________ 答案：what jobs we will get is unknown until 3 years later when we will graduate from university.     2【原句】what many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas.         [模仿要點] 句子結構: 主語從句＋ is ＋ that表語從句【模仿1】他想告訴我們的是一天下文當他在回家的路上看見一只小鳥受傷了。 __________________________________________________________________________________ 答案：what he wanted to tell us is that one afternoon when he was on his way home he saw a bird which was dying. 【模仿2】他缺席的原因是他在上學時被一輛小車撞傷了。 __________________________________________________________________________________ 答案：why he was absent is that he was badly hurt by a car when he went to school. 3【原句】they multiplied and filled the oceans and seas with oxygen, which encouraged the later development of early shellfish and all sorts of fish.  [模仿要點] 句子結構：which 引導一個定語從句對上句情況的進一步說明。【模仿1】我們常�？吹接腥藖y丟亂吐，這弄得我們的環境很臟 __________________________________________________________________________________ 答案：we often see some people throw rubbish and spit everywhere，which makes our environment dirty. 【模仿2】她的父母非常感激我們，醫生也高度評價了我們的急救，這使得我們意識到學習急救的必要性。 __________________________________________________________________________________ 答案：her parents were very thankful to us and the doctors thought highly of our first aid, which made us realize the necessity of learning first aid. 單元自測 （模塊）