IMAGINE a life without arms or legs! You can’t hold anyone in your   1 . You can’t walk anywhere with your feet. How would you last a day like that? Would you   2  at yourself in the mirror like Nick Vujicic, the 29-year-old Australian?
Nick was born without limbs（四肢）, so life was not   3  for him. At school many students played jokes on him   4  he looked different from everyone else. He was refused to be   5  friends, so he always felt   6 . However, he faced that bravely. He   7  to type and write with two toes（脚趾）at the age of six, and he could   8  surf and play golf. In college, he achieved great success and was among the   9  students in the studies. And he decided on   10  to do later in his life—to encourage others to work hard for their dreams.
Now Nick is one of the most popular   11  in the world. He travels to many countries and gives speeches about his story   12  difficulties. “Living life fully is about looking at what you   13 , not what you don’t have.” he said. His   14  encourages millions of people.
“I tell people to keep on getting up when they   15  and to always love themselves,” he said. “If I can encourage just one person, then my job in this life is done.”

Have you ever wondered why birds sing? Maybe you thought that they were just happy.  After all，you probably sing or whistle when you are happy.
Some scientists believe that birds do sing some of the time just because they are happy. However，they sing most of the time for a very different reason. Their singing is actually a warning to other birds to stay out of their territory.
Do you know what a ’territory’ is? A territory is an area that an animal，usually the male，claims(声称)as its own. Only he and his family are welcome there. No other families of the same kind are welcome. Your garden and house are your territory where only your family and friends are welcome. If a stranger should enter your territory and threaten(威胁)you，you might shout. Probably this would be enough to frighten him away.
If so，you have actually scared the stranger away without having to fight him. A bird does the same thing. But he expects an outsider almost any time，especially at nesting(筑巢)season. So he is screaming all the time，whether he can see an outsider or not. This screaming is what we call a bird’s song，and it is usually enough to keep an outsider away.
Birds sing loudest in the spring when they are trying to attract a mate and warn others not to enter the territory of theirs..
You can see that birds have a language of their own. Most of it has to do with attracting mates and setting up territories.
【小题1】 Some scientists believe that most of the time bird’s singing is actually _______.

I can’t remember when I started collecting litter. But it was when I got tired of   46  litter nearby that I realized no one else was going to pick it up.
I live near a forest in Ohio, America. I can walk there   47  three minutes. I used to love going there to play with my dog. But one day there was   48  much litter there that I became very unhappy. I decided to clean up the forest, and I wanted to   49  happy when I went again. I made my first trip to clean the forest that afternoon. I took a big black rubbish bag with me. Ten minutes   50  I started to pick up litter, my bag was full! There were cans, bottles, broken glass and newspapers in it.
From then on, I  51  to the forest four times a year to pick up litter. I often stay there for three hours. It makes me feel   52  to do something for the environment. After each trip, I look through all the litter that I’ve collected. If   53  of it is recyclable（可回收利用的）, I’ll keep it. I can’t understand why people drop litter. But I will keep on picking it up   54  they stop dropping it.. I know I am only doing a small bit   55  the earth, but I still think it is important.
【小题1】A.seeing           B.throwing          C.dropping         
【小题2】A.after            B.for               C.in
【小题3】A.such         B.very              C.so                   
【小题4】A.make         B.feel              C.look             
【小题5】A.after            B.later             C.before               
【小题6】A.had gone     B.have gone         C.go               
【小题7】A.tired            B.sad               C.great
【小题8】A.many         B.few               C.any      
【小题9】A.until            B.after             C.as soon as           
【小题10】A.helped          B.to help               C.help             

—____ the workers are very tired, _____they keep on working.

?? — They are great. We must learn from them.

A. Because; /??????? B. Though; /????????? C. Because; so?????? D. Though; but