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小博士：细心的同学们肯定发现了有些名词有单数(singular)和复数(plural)两种形式，而有些名词只有单数形式，这是怎么回事呢？让我来告诉你吧。英语中，名词按其所表示的事物的性质，可分为可数名词(countable noun)和不可数名词(uncountable noun)，可数名词有复数形式，不可数名词一般没有复数形式。名词单数变复数的变化规则见下表。
比一比，看谁写的单词多！
1 直接加-s的单词有：________________________________.
2 加-es的单词有：___________________________________.
3 变y为i再加-es的单词有：__________________________.
4 不规则变化的单词有：_______________________________.
查看习题详情和答案>>The second important way is that trees give us shade. On a hot summer day, people are eager(渴望)to have a rest under the shade of a tree after they have walked a long way. You can imagine how important the shade of a tree is to man and to animals.
The third important way is that trees help to prevent drought and foods. However, in many parts of the world, man has not realized the third important way. He has cut trees down in large numbers. In the end he finds that he has lost the best friends he had.
 The Importance of Trees |
| The First Important Way: 【小题1】____________________ _________________________ | The Second Important Way: To give man shade | The Third Important Way: 【小题2】______________________ _________________________  |
| Without trees it’s difficult for man and many animals to live on the earth. | On a hot summer, people 【小题3】________________ _______________________ are eager to have a rest under the shade. | Man has not realized this. Because of 【小题4】____________ __________________________ He finds that he has lost the best friends he had |
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— Tom won a car in prize-giving sales.
— What a(n) man!
| A．polite | B．unusual |
| C．serious | D．lucky |
Once upon a time, a young man was standing in the middle of the town announcing that he had the most beautiful heart in the world. A large crowd gathered, and they al praised his heart for it was perfect.
Suddenly, an old man appeared and said, “Why ,your heart is not as beautiful as mine.”
The old man’s heart was ful of scars（伤疤）. Some pieces of his heart were removed and some pieces from other people were put in, but they didn’t fit quite right. So there were several jagged（锯齿状的）edges. In fact, there were stil some holes in his heart where the pieces were missing.
The young man laughed,“Comparing yours with mine, mine is perfect and yours is a mess.”
“Yes,”said the old man. “But, every scar shows that I took out a piece of my heart and gave it to a person, and often he gave me a piece of his heart in return.”
“Why do you have some jagged edges in your heart?”asked the young man.“Because the shapes of the pieces weren’t the same.”“Then the holes?”“Sometimes I gave pieces of my heart away, and the other person hasn’t given back a piece of his, so … but I don’t care.”“How come?”“They remind me of the love we shared.”
The young man was deeply moved. He walked up to the old man, took a piece of his heart out and gave it to the old man.
The old man placed it in his heart, then took a piece from his old scarred heart and placed it in the wound（伤口）in the young man’s heart. It fitted, but not perfectly, as there were some jagged edges.
The young man looked at his heart, not perfect any more but more beautiful than ever.
How sad it must be to go through life with a whole untouched heart!
1. The young man stood in the town to _____.
A. meet the old man B. compare his heart with others’
C. show his beautiful heart D. give pieces of his heart to others
2. It’s clear that the old man was _____.
A. a sily man B. a humorous man
C. a wel-known man D. a kind-hearted man
3. We learn from the story that in the end the young man was _____.
A. lost B. moved C. hurt D. untouched
4. The old man said“… but I don’t care”means _____.
A. he didn’t expect others’return
B. he didn’t feel pain
C. he didn’t think it serious
D. he cared nothing
5.We can get more beautiful hearts by sharing _____
A. ideas B. scars C. love D. beauty
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