What was discovered by accident？ The answer is penicillin（青霉素）． It kills germs． By killing germs， it saves lives． Suppose you are sick． You go to a doctor． She examines you． She says you have a" staph'" infection（葡萄球菌感染）． She gives you some medicine． You take it． The medicine knocks out the staph． Soon you are well． Before penicillin， this would not happen． Staph was almost sure death．
Everyone wanted a medicine． Laboratories worked day and night． They grew the staph in small dishes． Then they tried to kill it． Nothing worked．
The laboratory dishes had covers on them． They kept things from falling into dishes． Molds（霉菌）were a big worry． They are always in the air． You can't see them． They're too small． There are thousands of different molds． Molds can make an experiment （实验）fail． That's why dishes are covered．
Dr． Alexander Fleming was working to kill the staph germ． He worked for years． One day he took a cover off a dish． He looked inside． There was a thick growth of staph germ． There was also some mol
d． Then he saw something strange． Where the mold was， there was no growth of staph． This is what Fleming probably thought． "By accident， I found a mold to kill the dreaded staph．"
This is how penicillin was found． But here's the real miracle（奇迹）． There are thousands of kinds of molds． But only one kind can kill staph． The mold must have fallen into the dish a few days before． The cover was probably off only a few seconds（秒）． In those few seconds the right mold fell into the right dish． Another man might have thrown the dish away． But Fleming was very careful and smart． He understood what the mold did． How lucky the humans were !
根据短文内容，选择最佳答案．
（1）During the experiments to find a medicine for staph infections， ．
A． the dishes were not covered
B． staph and mold were put together
C． mold was kept in small dishes
D． staph was grown in small dishes
（2）The word" dreaded" means " "．
A． famous
B． scary
C． healthy
D． endangered
（3）The last paragraph suggests that ．
A． accidents happen to everyone
B． the careful person does not have accidents
C． the careless person will miss valuable chances
D． luck is enough when doing scientific experiments
（4）Most of this passage is written by ．
A． telling an unusual story
B． showing the results of experiments
C． offering some reasons
D． giving some advice
（5）This passage is mainly about ．
A． medicine for a staph infection
B． useful accidents
C． Dr． Fleming's research
D． discovering penicillin
Many animals hide(躲藏) to stay alive. They hide in many ways. Some animals hide in leaves; some animals hide in snow. Usually their colors or shapes(形状) help protect them. It’s hard to see an Arctic bear in snow. Its white fur helps protect it. Chameleons(变色龙) can hide by changing colors. Their skin turns the same color as what is around them. Some chameleons can change colors in five minutes.
Many animals try to look bigger than they are to stay alive. Some animals can make other animals think they are very big. If they look very big, animals that are looking for food will run away. Bears can walk on two legs. They look very, very scary(可怕的). Some animals will run away from them.
Many animals try to stay around other animals. This helps them stay alive. Zebras stay close together so that they can help each other look out for danger. Seeing many stripes(条纹) at once can also confuse(使混乱) animals that want to eat them. Some birds stay in a circle, each toward a different direction. In this way they can also help each other stay alive by looking around for animals that may want to eat one of them.Animals have ways to stay alive. Which animal try to look bigger than they are to stay alive in the passage?
| A．Zebras. | B．Chameleons. |
| C．Birds. | D．Bears. |
Why do animals hide?
| A．Because they like to play hide-and-seek. |
| B．Because they are shy. |
| C．Because they want to catch other animals. |
| D．Because they want to protect themselves. |
How do Chameleons hide?
| A．They change colors. |
| B．They change shapes. |
| C．They hide in snow. |
| D．They hide in leaves. |
How do zebras hide?
| A．Become good friends. |
| B．Talk to each other. |
| C．Help each other look out for danger. |
| D．Eat and play together. |
Why do animals try to look bigger than they are?
| A．They want other animals to run away from them. |
| B．They want other animals to follow them. |
| C．They want other animals to see them. |
| D．They want other animals to like them |
What do people want to do at Nancy’s Gym?
| A．To enjoy swimming |
| B．To learn skating |
| C．To become thinner |
| D．To become taller |
Lucy likes skating. Which advertisement is she interested in?
| A．Ice World |
| B．Water World |
| C．Nancy’s Gym |
| D．Keep fit |
You can call at _________ when you want to swim.
| A．45562233 | B．88682526 |
| C．21518296 | D．85882526 |
You can go to swim in Water World at___________.
| A．8:00 a.m. | B．9:30 a.m. |
| C．10:00 p.m. | D．11:00 p.m. |
Which activity costs the most for an adult?
| A．Keeping fit at Nancy’s Gym. |
| B．Skating in Ice World. |
| C．Swimming in Water World. |
| D．Making the Telephone. |
We go shopping (购物) on Sunday. I often go to the supermarket (超市) with my mother on Sunday morning. Father likes fruit very much. We buy some bananas for him. Mother likes red apples, but the apples in the supermarket are green. We don’t buy(买) them. The strawberries are very nice. Mother likes them very much and buys some for herself(她自己). The oranges are very nice, too. Mother buys some for me. I like oranges very much.
We need some vegetables. The vegetables in the supermarket are very good. We buy some broccoli. I don’t like broccoli, but my parents like it. I like carrots very much. We buy lots of carrots. After shopping, mother and I have some salad, French fries and ice cream. Then we go back home with the fruit and vegetables.Who likes strawberries very much? ________
| A．I | B．Father |
| C．Mother | D．I don’t know. |
---- Does mum buy apples? ----____________.
| A．Yes, she does. |
| B．No, she doesn’t. |
| C．She likes apples. |
| D．She doesn’t like apples. |
Mother buys some oranges for _______.
| A．herself | B．father |
| C．us | D．me |
My parents like _______, but I don’t like it.
| A．hamburgers |
| B．strawberries |
| C．carrots |
| D．broccoli |
After we buy the fruit and vegetables, _____________.
| A．we go back home |
| B．we want to buy some new clothes |
| C．we eat some apples |
| D．we have some salad, French fries and ice cream |
Jim: Let’s play computer games.
Peter: That sounds good. Where’s your computer?
Jim: I don’t have a computer. Do you have a computer?
Peter: No, I don’t. But I have a TV. Let’s watch TV.
Jim: No, it’s boring. Let’s play tennis. I have a tennis racket.
Peter: Good. Where is it?
Jim: On the sofa. Do you have a racket?
Peter: No, I don’t. Does your brother have a racket?
Jim: Yes, he does. And he has tennis balls.Does Jim have a computer? ________
| A．Yes, he does. |
| B．No, he doesn’t. |
| C．He has a computer. |
| D．He has two computers. |
Jim has a racket. Where is it? ________
| A．It’s on the sofa. |
| B．It’s near the sofa. |
| C．It’s behind the sofa. |
| D．It’s under the sofa. |
---- Does Peter have a tennis racket?
---- ________
| A．Yes, he does. |
| B．No, he doesn’t. |
| C．He has two tennis rackets. |
| D．He doesn’t have two tennis rackets. |
______ has a brother.
| A．Jim | B．Peter |
| C．Jim and Peter | D．Jelly |
Jim and Peter will(将会) _______ .
| A．play computer games |
| B．watch TV |
| C．play tennis |
| D．go to school |
Mr. Brown is from England. He and his wife（妻子）are teachers . They teach English in Shanghai. They have a son and a daughter. They are John and Lucy. John is a middle school student, but Lucy is not. She is only six.
They have two bikes. One is big, and the other is small. The big bike is for John. The small one is for Lucy.
On Sundays, sometimes they are at home, sometimes they go to the parks. They like China. They have a lot of Chinese friends.
根据短文内容判断正误，正确的写T，错误的写F。Mr. Brown and Mrs. Brown are English teachers.
They have a son and a daughter .
John isn’t a student because he is only six years old .
The small bike is for John , and the big one is for his sister .
They have many friends in China .