7.But men， as you know， are always finding new ways of building houses， and improved methods of doing almost all kinds of labor.
而人类正如大家所知道的， 总是会不断地找到建房的新方法以及从事各种劳动的更巧妙的办法。
1 )as 是关系代词， 在句中作动词know 的宾语， 指But men are always.
all kinds of labor。
2 )句中的现在进行时不表进行， 而表一般现在时。在英语中， 现在进行时有时用来代替一般现在时， 表示一个经常性的动作或状态， 这时主要是表示一种感情(如赞叹， 厌烦等)。
He is always thinking of the revolutionary work.
他总是想着革命工作。(表示赞许)
He is constantly leaving things about.
他老是把东西乱扔。(表示不满)
He is always boasting. 他老爱说大话。(表示厌烦)
3 )all kinds of 各种各样；许多
She likes a ll kinds of sports. 他喜欢各种运动。
He has all kinds of time to get there. 他有足够的时间赶到那里。
8.After a while he let him out in a room where there was a great variety of things.
过了一会儿， 把它放出来， 放到一个有各种各样东西的房间里。
1 )while 在这里是个名词， 意思是“ 一会儿， (一段时间)”。
It was a little while before I heard any sound from inside.
过了一会儿我才听到有声音从里面传出。
2 )let out 释放， 放出
She told us that none of the prisoners of war had been let out.
她告诉我们这些战犯全都没有释放。
He let out the cow after milking.
她挤过牛奶后， 就把母牛放了出去。
3 )variety 是个名词， 和不定冠词a(an)连用， 意思是“种种”。
Iron has a variety of uses. 铁有种种用处。
The college library has a wide va riety of books.
学院图书馆拥有种类繁多的图书。
9.Nor is this all. 这还不是全部(不仅如此)。
这是倒装句。代词so， neither， nor 等置于句首时， 全句需要倒装。
If you can do it， so can I. 你如果能做， 我也能做。
If you don’t go， neither shall I. 你不去， 我也不去。
He didn’t buy this dictionary. Nor did I.
他没有买这种词典， 我也没有买。
10. Their minds are so much unlike ours that they do not know the
difference between right and wrong.
它们的思维与我们人类如此不同， 以至于它们分不清正误。
1 )so.that. 如此..以至于
He spoke so rapidly that we could not clearly understand him.
他说得太快， 使我们不能清楚地了解他的意思。
2 )ours 是名词性物主代词， 相当于our minds， 在句中作介词unlike
的宾语。名词性物主代词在句中能作表语、主语、宾语等。
This umbrella is yours and that one is hers.
这把伞是你的， 那把是她的。(表语)
His was a life of persistent fighting.
他的一生是不断战斗的一生。(主语)
You may use my pen， and I’ll use hers.
你可以用我的笔， 我用她的好了。(宾语)
That remark of yours is quite correct.
你的那个意见是很正确的。(介词宾语)
3 )right(正确)和wrong(错误)在这里是名词。
He knows right from wrong. 他能辨别是非。
Two wrongs do not make a right. 两个错误不等于一个正确。
(或： 别人错不等于你就对了。)
练习答案
课文A 练习
I. 阅读理解：
1. d. 2. d 3. d 4. c 5. c
II. 从课文中找出下列单词或短语的同义词：
1. bravery 2. eager 3. civilized 4. overseas 5. substitute of 6. foundation 7. combination 8. belief 9. protein 10. contain III. 用括号里所给名词的复数形式填空：
1. pianos， violins 2. firemen 3. data 4. deer(s)5. potatoes， tomatoes
IV. 将下列句子译成英语：
1. The soldiers during World War II ate a great number of potatoes.
2. There is a wrong idea that by eating an animal you can get the good qualities of
that animal for yourself.
3. It has not been proved whether fish is the best brain food.
4. Milk contains rich protein， and many people drink it for breakfast.
5. Today， many people hold wrong ideas about some food.
词汇练习
I. 用所给单词的正确形式填空， 注意词性：
1. a. civilize b. civilized c. civilization 2. a. free b. ******* c. freely 3. a. digest b. digestible c. digestion d. digestive， digestible 4. a. scientists b. scientific c. science II. 用下列单词的正确形式填空：
1. mixture 2. poisonous 3. suppose 4. digest 5. widespread 6. overseas 7. similar 8. foundation 9. eager 10. substitute III. 写出下列单词的名词形式：
1. digestion 2. mixture 3. belief 4. civilization ·
5. combination IV. 把下列句子译成英语：
1. We have not found a substitute for him.
2. Children are eager to become as strong and brave as the heroes in the film.
3. He is supposed to be a person who runs fastest among us.
4. Some stories are widespread， while others are not.
5. As a matter of fact， meat and potatoes can be eaten together.
6. Schools are often thought of as a small society.
课文B 练习
I. 根据课文判断下列句子正确与否：
1. √ 2.× 3. √ 4.× 5. √ 6. √ 7. √ 8. √ 9.× 10. √
II. 根据课文填上所缺的内容：
1. true 2. run races， wrestle， have mock fights together
3. Frog， owls 4. sport， very grave
5. dams 6. take care of sheep
7. make improvements 8. fashions， none from each other
9. methods 10. instinct
11. dog， cat， horse， elephant， frog， owl， beaver， ant， mocking bird， parrot
词汇练习
I. 从右边一栏中找出与左边一栏单词相应的定义：
1. d 2. c 3. b 4. a 5. e
II. 选择填空：
1. D 2. A 3. C 4. D 5. D 6. D 7. A 8. B 9. B 10. C
语法练习
I. 说出下列句子是简单句、并列句、还是复合句
1. 复合句 2. 并列句 3. 复合句 4. 并列句 5. 复合句 6. 并列句 7. 并列句 8. 简单句 9. 并列句 10. 简单句 II. 选择填空：
1. B 2. D 3. D 4. C 5. B 6. A 7. C 8. C 9. D 10. A