完型填空：（每小题1分，满分20分）
It was a cold winter morning. Half asleep at the train station, I stared into the distance,   41   for the train to take me to my   42  in Boston. The world was quiet. The very few people on the street kept to themselves,  43  their steaming cups of coffee.
Reaching into my pocket as the  44  was getting close, my hand searched for the $ 20 bill to pay my fare. The pocket was 45 ! I searched through my bag and then I felt  46 . Unless the money dropped from the sky, I’d be  47 there. “What’s the matter?” A short, elderly man stood before me. “Oh, nothing…. Well, I  48   my money and now I can’t pay for the ticket. I’m going to  49   my match class, and the train is leaving.”
“Here, use this.” The man held a $ 20 bill. I looked up,  5 0 . People just didn’t do that anymore. Everyone worried about their own  51 , rarely stopping to think about others, especially teenage strangers. “Thank you, but no, I can’t.”
“  52  it – go!” The man pushed me  53  the train.  I bought a round – trip ticket, and he refused the change I  54 to give him back. I did not know what to say – a million thoughts raced through my mind, yet I stood   55  .
For the train ride I was wordless. I began to see the world through  56 eyes. That man made a difference with such a simple  57  .
A week later I was at the train station again, with an extra 20$  58  I saw the man. And there he was. “Excuse me, sir, I believe I owe you this.” I  59  the money into his hand. Failing to refuse, he said, “Just remember to do the same for someone in your shoes someday.” I smiled, content.
The elderly man is my hero. For many, heroes are famous, but my hero is a   60  stranger who taught me a lesson in life. I will never forget his kindness.

Did you ever wonder why leaves change colors in autumn, or how it happens? Here’s a quick explanation.
First of all, you’ve probably noticed that not all trees lose their leaves. There are two major types of trees: deciduous trees and evergreens. Evergreens keep their leaves and stay green all year long. The deciduous trees are the ones that lose their leaves each year.
In autumn, the days begin to get shorter. The sun is also lower in the sky at noon, which causes temperatures to be cooler. The combination of less sunshine and lower temperatures is what causes the deciduous trees to drop their leaves. In winter, deciduous trees “go to sleep”, sort of like a bear goes into hibernation.
Leaves are the food factories for a plant. Unlike animals，plants make their own food by taking energy directly from the sun. Plants do this by using a chemical in their leaves called chlorophyll.
Chlorophyll is green. During the spring and summer the leaves of a deciduous tree look green because there is a lot of chlorophyll there. In autumn, however, the sunshine becomes more  scarce and the leaves on the trees stop making new chlorophyll. As the old chlorophyll starts to break down, the green color of the leaf begins to go away.
You’ve probably also noticed that the leaves of different kinds of trees change different colors. The leaves of some trees turn yellow or orange, while the leaves of other trees turn bright red or purple. The different colors are caused by the different chemical reactions that are happening in the leaves.
For example, the leaves of some trees turn yellow when the chlorophyll breaks down. When the green chlorophyll goes away, a yellow pigment in the leaf becomes visible. The yellow pigment, called cartenoid, was already there during the summer, but is was not easily seen because there was too much green chlorophyll.
In other trees where the leaves turn red or purple a different chemical reaction takes place. In those leaves the chlorophyll also breaks down, but another chemical reaction takes place at the same time. Chemicals in the leaves, called starches, begin to change into chemicals called anthocyanins, which give the leaves their red and purple colors.
So next time you see the beautiful colors of autumn you will also know the science behind that beauty.
46.   What is the correct term for trees that lose their leaves in the autumn?
A. Evergreens       B. Deciduous        C. Cartenoids  D. Anthocyanins
47.   Which of the following is NOT mentioned as a cause of trees dropping their leaves?
A. A change in temperature   B. The amount of daylight available
C. Extra chlorophyll         D. Chemical changes in the leaves
48.   If there are 50 evergreens and 10 deciduous trees in a forest, in autumn what color are most of the leaves in the forest likely to be?
A. Green B. Red and purple
C. Yellow        D. not enough information to determine the answer
49.   Which of the following is only present in leaves during the autumn?
A. Chlorophyll       B. Starch C. Cartenoids        D. Anthocyanins
50.   Where would such an article mostly likely be published?
A. In a book                   B. In a primary school science text book
C. In a magazine for young people       D. All are equally likely

______ around the Water Cube , we were taken to see the Bird’s Nest for the 2008 Olympic Games.

When high school started, Becky and I became best friends. We   36  many interests and quickly became inseparable. When high school ended, we both cried   37  we would attend different colleges.
Our first term of university life was   38 . Our telephone bill and e-mails were incredibly long. In the second term I found some new friends with whom I felt very   39 and I could   40  out my feelings. I was eager to share my new friends with Becky.
When Becky finally visited me at my school, we were excited. __41__, something unexpected happened when I   42  her to my new friends. Her eyes grew dark and I could see the   43  within them. My new friends tried to share their friendship, but Becky seemed   44  to accept it. I didn’t understand   45  the people I love most couldn’t love each other.
Becky   46 . I knew she was not happy. I thought long about __47__ happened. At last, I found the answer. Becky saw me with my new friends and   48  that we no longer shared the same experiences. She saw all the fun I was having   49  her and wished she could a part of it.
I wrote a letter to Becky   50  she’s always my best friend. I told her everyone had many friends, who were indeed life’s greatest   51 . Becky wrote me back soon. She was in   52  and felt sorry about what she had done.
I think Becky and I both learn an important lesson from it.   53  can influence our friendship and change the experiences we’ve shared. We are now walking on two different paths of   54 . While new friends are special and exciting, old friends are always there,   55  to share their heart and soul, no matter how far apart.

It was a cold winter morning. Half asleep at the train station, I stared into the distance,   36   for the train to take me to my   37   in Boston. The word was quiet. The very few people on the street kept to themselves,   38   their steaming cups of coffee.
Reaching into my pocket as the   39  was approaching, my numb hand searched for the $ 20 bill to pay my fare. The pocket was   40  ! I searched through my bag and then I felt   41  . Unless the money dropped from the sky, I’d be   42   there.
“What’s the matter?” A short, elderly man stood before me.
“Oh, nothing…. Well, I   43   my money and now I can’t pay for the ticket. I’m going to   44   my match class, and the train is leaving.”
“Here, use this.”
The man held a $ 20 bill. I looked up,   45  . People just didn’t do that anymore. Everyone worried about their own   46  , rarely stopping to think about others, especially teenage strangers.
“Thank you, but no, I can’t.”
“  47  it – go!” The man pushed me   48   the train.  I bought a round – trip ticket, and he refused the change I   49  to give him back. I did not know what to say – a million thoughts raced through my mind, yet I stood   50  .
For the train ride I was silent. I began to see the world through   51  eyes. That man made a difference with such a simple   52  .
A week later I was at the train station again, with an extra $ 20   53  I saw the man. And there he was.
“excuse me, sir, I believe I owe you this.” I   54  the money into his hand.
Failing to refuse, he said, “Just remember to do the same for someone in your shoes someday.” I smiled, content.
The elderly man is my hero. For many, heroes are famous, but my hero is a   55  stranger who taught me a lesson in life. I will never forget his kindness.