注意：此结构中常用的名词有：size, height, weight, length, width depth等。例如： 1). This ruler is three times as long as that one. = This ruler is three times longer than that one.
= This ruler is three times the length of that one. 这把尺子是那把的三倍那么长。 2). There are four times as many students as we expected. 到的学生是我们预计的五倍。
[解释] twice as ... as... 是的两倍，英语常见倍数的表示句型：
1). 倍数 + as + adj./adv. + as “是……的几倍” My room is twice as large as his. 2). 倍数 + adj./adv.比较级 + than “比……(多/大)几倍”My room is twice larger than his.
3). 倍数+ the +表示长度/高度/宽度等的名词+ of “是……的长度/高度/宽度几倍” My room is twice the size of his.
注意：此结构中常用的名词有：size, height, weight, length, width depth 等。 [练习] 完成句子或翻译。
1). 这把尺子是那把的三倍那么长。
_____________________________________________________________________2). 到的学生是我们预计的五倍。
There are ______ ______ ______ ______ ______ ______ we expected. 课文要点 Ⅰ.课文词汇填空
根据课文内容完成下面语法填空，注意单词拼写和词语用法：
As the result of \ 1 (move) around the sun. The gasses which were to make the earth's 2 （大气层）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 (极度的) 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
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passed, green plants taking carbon dioxide and producing 8 （氧气）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.
Ⅲ.课文佳句背诵与仿写
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.
[模仿要点] 句子结构： what＋主语从句＋is … till +时间名词＋定语从句 【模仿1】他要给我什么礼物一直不知，直到昨天下文他来看我是我才知道。 _____________________________________________________________________【模仿2】没人知道我们将要得到什么样的工作，直到3年后我们从大学毕业以后才知道。
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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. [模仿要点] 句子结构: 主语从句＋ is ＋ that表语从句
【模仿1】他想告诉我们的是一天下文当他在回家的路上看见一只小鸟受伤了。 _____________________________________________________________________ 【模仿2】他缺席的原因是他在上学时被一辆小车撞伤了。
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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. [模仿要点] 句子结构：which 引导一个定语从句对上句情况的进一步说明。 【模仿1】我们常常看到有人乱丢乱吐，这弄得我们的环境很脏
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【模仿2】她的父母非常感激我们，医生也高度评价了我们的急救，这使得我们意识到学习急救的必要性。
_____________________________________________________________________ 单元自测 1完形填空
阅读下面短文，掌握其大意，然后从1—10各题所给的A、B、C和D项中，选出最佳选项，并在答题卡上将该项涂黑。
Who said: \！\，not all \ 1 thing. When life gives you a kick, let it kick you 2 ! In the 1920s, Ernest Hemingway 3 something about \ 4 to succeed as a writer when 5 struck. He lost a suitcase containing all the manuscripts (手稿) that he had been planning to publish.
Hemingway couldn't imagine doing his work all over again. All those months of writing were simply 6 .
He told a friend about his bad luck, who told him it was actually very good 7 ! He assured (向...保证) Hemingway that when he rewrote the stories, he would forget the 8 parts; only the best material would reappear. He encouraged Hemingway to start again, but with optimism and 9 this time. Hemingway did rewrite the stories and eventually became a world-famous writer.
Don't pray for fewer problems; pray for more ability. Don't ask for smaller challenges; ask for greater 10 . When life gives you a kick, let it kick you forwards! 1. A. essential
B. confusing B. off B. said B. struggling B. changes B. failed
C. acceptable
D. bad
2. A. backwards 3. A. learned 4. A. waiting 5. A. challenges 6. A. buried 7. A. fortune
C. on D. forwards C. heard C. dreaming
D. solved D. wishing
C. disaster D. failure C. wasted
D. undone
B. result C. journey D. idea
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8. A. weak 9. A. knowledge 10. A. chance
2.语法填空
B. important
C. good D. last
B. confidence C. imagination D. luck B. sympathy
C. wisdom
D. kick
阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空，并将答案填写在答题卡标号为1—10的相应位置上。
On Wednesday morning at eleven o'clock, I was walking down Main Street. I had just parked my car. Suddenly I heard two shots. I thought they 1 (come) from the bank. I ran toward the bank. I saw a man 2 (come) out. He was short and fat 3 a big moustache. More 4 (importance),he had a bag of money and a gun in his hands! 5 I could do anything, he ran up the street 6 disappeared behind a bus.
That afternoon I went to the movies. 7 happened? I saw the thief again at the foot of the stairs! I telephoned the police from a telephone next to the rest rooms. The police arrived in 8 than five minutes. They arrested the thief just as he 9 (buy) a chocolate bar from the candy machine. What an exciting day! And best of all, the bank gave me 10 $ 100 reward.
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Unit 4 Astronomy: the science of the stars答案
语言要点 Ⅰ.词语辨析 1. loudly / loud / aloud 【练习】根据句子的意思在括号里填入适当的词。 Keys: 1). louder 2). aloud 3). loudly 4). loud 5). louder 2. unlike / dislike 【练习】根据句子的意思在括号里填入适当的词。 Keys: 1). dislikes 2). unlike 3). disliked 4). unlike 3. remain/leave 【练习】根据句子的意思在括号里填入适当的词。 Keys: 1). left 2). remained 3). remaining 4). left 5). left 6). waiting 7). unchanged 8). to be done 4. climate / weather 【练习】根据句子的意思在括号里填入适当的词。 Keys: 1). weather 2). climate 3). climate 4). climate; weather 5. now that / since / because / as 【练习】根据句子的意思在括号里填入适当的词。 Keys: 1). since/now that 2). because 3). for 4). Now (that)
Ⅱ.词性变化
【练习】用括号内所提供词的适当形式填空。 Keys: 1). lied; lay; laid 2). prevention 3). violence 4). development 5). developing 6). fundamental 7). physicist
Ⅲ.重点词汇
1. system n.[c] 系统；体系；制度；方法 systematic adj 有系统的; 有条理的 [练习] 根据句子的意思完成句子。
Keys: 1). educational system 2). railway system
2. lay vt. (laid, laid, laying) 把放下；摆设；铺(地毯) ；产(蛋) [练习] 根据句子的意思在括号里填入适当的词或翻译。
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