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
My name is Alice. I am a school girl. My brother and I are twins(双胞胎). We both study at No.1 Middle School. We are in Class Five，Grade One. There are twenty-five boys and eighteen girls in our class.
We go to school from Monday to Friday. We have no classes on Saturdays and Sundays. On school days, we usually get up at six, and have breakfast at 6:30. We come to school at 7:00. Classes begin at eight. We have four lessons in the morning and two in the afternoon. We learn Chinese, math, English, geography, history and other subjects. We like Chinese. We like English, too. Both of us are good at it. We have lunch at 12:15. At three fifty we have sports. We go home at 5:00. We have dinner at 6:00. We do homework at seven every evening and go to bed at half past nine, but sometimes we go to sleep at about ten.Alice’s brother is ________ and Alice is _________
A. a worker; a student
B. a student, a worker
C. a student, a studentThey have _________ at fifteen past twelve.
A. breakfast B. lunch C. dinnerThey do homework from_______ to______ every morning.
A. Monday, Friday
B. seven, half past nine
C. six, half past eight There are_______ boys and ______ girls in their class.
A. 25, 20 B. some, any C. 25, 18Do they often have sports in the morning or in the afternoon?
A. Yes, they do
B. No, they don’t
C. In the afternoon
A frog (青蛙) is born(出生) in a small river. When he is young（小的）, the river is his home. He doesn't know his parents, but he has hundreds of brothers and sisters. He swims about and plays with them all the time. At that time, he doesn't look like his parents. He has no legs and he has a big tail (尾巴). So he looks like a fish.
Then his tail gets shorter and shorter. And he has four legs and a very short tail. He looks like his parents now. Then he can eat a lot of bad insects (害虫).Where is a frog born?
A. On a farm
B. On the land
C. In the riverWhich of the sentences(句子) is right?
A. A baby frog stays at home and knows only his parents.
B. A baby frog looks like his parents but he doesn't know them.
C. A baby frog looks like a fish and he has a lot of brothers and sisters.Who does a frog play with all the time?
A. His parents
B. His brothers and sisters
C.InsectsA frog has ______, when he looks like his parents.
A. four legs and a very short tail.
B. four legs but he has a long tail.
C. no legs but he has a long tail. A baby frog __________
A. can’t swim
B. can’t eat bad insects
C. can eat bad insects
The Wenhua International School
| You must |
You mustn’t |
| Arrive at school by half past seven every morning. |
Wear jeans. |
| Hand in your homework by eight. |
Eat or drink in the classroom. |
| Look clean and tidy. |
Bring MP3 to school. |
| Be quiet in the library. |
Run or shout in the school buildings. |
| Stay on the playground at break time. |
Talk loudly in the hallways. |
| Stand up when a teacher comes into the classroom. |
Fight. |
What can’t you do when you are in the school buildings?
| A．Eat or drink. | B．Run or shout. |
| C．Talk loudly. | D．Listen to music. |
Can you bring your MP3 to school?
| A．No, we can’t. | B．Yes, we can. |
| C．No, they can’t. | D．Yes, they can. |
What do you have to do when your teacher comes into the classroom？
| A．Hand in my homework. | B．Be quiet. |
| C．Stand up. | D．Clean the classroom. |
Can you fight in the school?
| A．I don’t know. | B．No, we can’t. |
| C．Yes, we can. | D．Yes, we must. |
When do you have to get to school every morning?
| A．By half past seven. | B．By eight. |
| C．By half past eight. | D．By seven. |
Bill is from Australia. He lives in Sydney. He can speak French and English, but he can' t speak Chinese. He has a pen pal in the United States. Her name is Lisa and she lives in New York. Bill' s favorite sport is basketball and he can play the guitar. Lisa' s favorite sport is tennis. She can't play the guitar, but she can play the piano and sing very well.Bill is from_______.
| A．Australia | B．France |
| C．the United States | D．the UK |
Lisa is an ________.
| A．Chinese | B．American | C．English | D．Japanese |
What languages does Bill speak?
| A．Chinese | B．French | C．English | D．B and C |
What is Bill' s favorite sport?
| A．tennis | B．volleyball | C．soccer | D．basketball |
Which sentence is NOT right(正确的)?
A. Bill has a pen pal in the USA.
B. Bill can play the piano and Lisa can play the guitar.
C. Bill and Lisa like different sports.
D. Lisa lives in New York.
Tom often gets up at six. He has breakfast at home. He goes to school at half past seven. Classes begin at eight. There are four classes in the morning and two in the afternoon. Tom studies hard. He likes English very much. He reads it every morning. He goes to school from Monday to Saturday. He has no classes on Sunday.Tom has supper at six twenty. In the evening, he does his homework. He goes to bed at about nine every day.
根据短文内容判断正（T）误（F）Tom has breakfast at school.
Tom has six classes on Sunday.
Tom reads English in the morning and does his homework in the evening.
Tom goes to school at 7 on Sunday.
Tom has supper at six every day.