本课主要语言点
1. The Atlantic Ocean is one of the oceans that separate the Old World from the New.
在表示河流，海洋，群岛，沙漠等地理名称的名词前，以及以复数形式出现的国名前要用定冠词，例如：the Yellow River（黄河），the Pacific Ocean（太平洋）, the Philippines （菲列宾）
在表示某一座山，岛屿或某一个湖时不用定冠词，例如：Yellow Mountain（黄山），Lake Erie（伊利湖），Hainan Island（海南岛）
separate from是常用词组，在句子中的意思是“（使）分离，（使）分开”，请翻译下面的句子：
英吉利海峡把英法两国隔开。（The English Channel separates England from France.）
the Old world指欧，亚，非三洲，有时仅指欧洲。the New （World） 指哥伦布发现的美洲大陆。
2. For centuries it kept the Americas from being discovered by the people of Europe.
keep… from doing 是习惯用法，意思是“使…不…”。
例如：It is really not easy to keep Father from smoking.（要使父亲不抽烟真不容易。）
3. Many wrong ideas about the Atlantic made early sailors unwilling to sail far out into it.
make sb. unwilling to do sth. 意为“使得某人不愿做某事”。例如：His indifference to work made everybody unwilling to cooperate with him.（他对工作的冷漠态度使得所有的人都不愿与他合作。）
主语＋动词＋宾语＋补语（SVOC）的句型在课本第二单元的语法中已有较详细的论述。
4. One idea was that it reached out to “the edge of the world”。
Another idea was that at the equator the ocean would be boiling hot.
这两个都是表语从句和主句中的系动词连用的句子。结构为：主语＋系动词＋表语从句。请看下面的例句：My idea is that we contact him as soon as possible.（我的想法是我们应该尽快跟他联系。）
请注意辨析another 和other：
another由 an＋other构成，只和单数可数名词连用。other可用于所有名词前。another＋单数名词表示不定的“另一个”，the other＋单数可数名词表示特指的“另一个”。
boiling hot意思是“滚热的，酷热的”。此处的boiling不是形容词而是副词，表示热的程度，修饰hot.
5. Sailors were afraid that they might sail right off the earth.
此句中，that引导的名词从句做宾语。
6. The Atlantic Ocean is only half as big as the Pacific，…
在第一单元中我们讨论过副词的同等比较。本句中as big as 则是形容词的同等比较。在这类句子中，可以有表示程度的状语。例如：
This book is not half as interesting as that one.（这本书还不如那本书一半有趣。）
7. But suppose no more rain fell into it and no more water was brought to it by rivers.
suppose 常常做动词用，意思是“假定；猜想；认为”。例如：
I suppose he is very nervous.（我猜想他很紧张。）
在本句中suppose（也可以用supposing）是一个连词，意思是“假设（= if）；假使…结果会怎么样”。例如：
Suppose he is ill， what shall we do？（假如他病了，我们怎么办？）
8. It would take the ocean about 4000 years to dry up.
it takes （sb.） some time to do sth. 是很常用的一个句型。例如：
1） 我骑自行车到学校要花半小时。（It takes me half an hour to get to school by bike.）
2） 他花了两个星期时间才看完那本书。（It took him two weeks to finish reading that book.）
9. On the average the water is a little more than two miles deep， but in places it is much deeper.
on the average在句子中的意思是“平均而言”。
a little 在句子中修饰more，表示程度，意思是“一点儿，稍许”。much在句子中修饰
deeper，也表示程度，加强形容词比较级，意思是“…多”。
10. This “deep” measures 30，246 feet——almost 6 miles （9.6km）。
本句中的deep做名词用，意思是“深处”，“海渊”（水深超过3000英里）。
measure 在句子中做动词用，意思是“测量”，“有…深”。
11. One of the longest mountain ranges of the world rises from the floor of the Atlantic.
本句中的 longest与课文前几段中出现的narrowest，saltiest，deepest一样，都是形容词的最高级形式。因为这几个词是单音节词或是以元音结尾的双音节词，所以，最高级的构成是在词尾加-est.对于大部分两个音节以上的形容词，最高级的构成是在形容词前面加most.
rise 是一个不及物动词，在句子中的意思是“升起；隆起”。
1） rise 不及物动词 （起立；上升，高耸；浮现）
The old lady rose to her feet when she heard the doorbell.
The tower rises to a height of 70 feet.
An idea rises in my mind.
2） raise 及物动词 （举起；养育；提高；召集）
If you have any questions， please raise your hands.
When Father was in the army， Mother had a hard time raising three children.
The management promised to raise the workers' salary after the negotiation.
He failed to raise the money for his father's heart operation.
3） arise 不及物动词 （升起；出现；由…引起）
Heavy smoke arose beyond the mountain.
New problems arise when old ones are solved.
4） arouse 及物动词 （唤醒；激起，引起）
The noise outside aroused him from sleep.
floor在句子中的意思是“海底”。在其他语言环境中，floor当然有其他的意思。如；
1） He lives on the seventh floor.（他住在7楼。）
2） The wood floor gives a feeling of warmth in the winter. （冬天时，木地板给我温暖的感觉。）
3） He was given the floor at the meeting.（他在会上得到了发言权。）
12. Several hundred miles eastward from Florida there is a part of the ocean called the Sargasso Sea.
called the Sargasso Sea 是修饰ocean的定语从句，在其前省去了which is.
13. In the days of sailing vessels the crew were afraid they would be becalmed here. Sometimes they were.
crew是一个集合名词，指“全体船员”，后面的谓语动词可以用单数也可以用复数，此句中谓语动词用的是复数were，因为从句子中可以推断出是许多vessels（船）上的船员。Sometimes they were.句子中省略becalmed.
14. The Atlantic furnishes much food for the people on its shores.
furnish sth For sb. 意思是“为…提供”，我们同样可以用furnish sb. with sth.来表达这个意思。
本课主要词组及句型
词组：
1. separate from 2. keep sb. from doing sth.
3. be unwilling to do sth. 4. between A and B
5. make sth unusual 6. so…that
7. dry up 8. on the average
9. rise from 10. furnish sth for sb.
11. pile up 12. from…to
句型：
A.定语从句：
1） The Atlantic is one of the oceans that separate the Old World from the New.
2） Ocean currents affect the climates of the land near which they flow.
B.表语从句：
1） One idea was that it reached out to “the edge of the world”。
2） Another idea was that at the equator the ocean would be boiling hot.
C.结果状语从句：
1） There is so much water in the Atlantic that it is hard to imagine how much there is.
2） We now have such fast ways of travelling that this big ocean seems to have grown smaller.
D.形容词的比较级和最高级：
1)The Atlantic is only half as big as the Pacific， but still it is very large.
2)It is more than 4，000 miles wide where Columbus crossed it.
3) Even at its narrowest it is about 2，000 miles wide.
4)Also， it is the world's saltiest ocean.
5) The deepest spot i
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