(2018·山东临沂)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 mold. 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. health 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
九年级英语阅读单选中等难度题
(2018·山东临沂)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 mold. 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. health 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
九年级英语阅读单选中等难度题查看答案及解析
(2018·山东临沂) _______ popular festival Halloween is in North America!
A. What B. What a
C. How D. How a
九年级英语单选题中等难度题查看答案及解析
The little boy hiding in the forest by the police yesterday.
A. discovered B. is discovered C. was discovered D. discovers
九年级英语单项填空中等难度题查看答案及解析
The little boy____hiding in the forest by the police yesterday.
A. discovered B. is discovered C. was discovered D. discovers
九年级英语单选题中等难度题查看答案及解析
The little boy____hiding in the forest by the police yesterday.
A.discovered B.is discovered C.was discovered D.discovers
九年级英语单选题中等难度题查看答案及解析
(2018·山东临沂) Of all the blue holes in the world, Sansha Yongle Blue Hole in the South China Sea is now _______. It is 300.89 meters deep.
A. deeper B. very deep
C. as deep as D. the deepest
九年级英语单选题中等难度题查看答案及解析
(2018·山东临沂) The TV news reports that there ________ a storm the day after tomorrow
A. is B. was
C. will be D. has be
九年级英语单选题困难题查看答案及解析
(2018·山东临沂) Shanghai is one of the first cities in China to see bike sharing fever. Shared bikes can now be found all over the city. 1.On streets see riders of your age. Some might even be younger than you. Unluckily, there have been some accidents involving (涉及) shared bikes.2.
One of the most serious accidents took place in March. One Sunday afternoon, a boy was riding an ofo bike (共享单车). He was hit by a bus and later died. The boy’s parents were not by his side. 3.He was only about 10 years old.
The good news is that Shanghai has been trying to manage bike sharing by making rules. The rules are still being discussed, but some of the rules have been decided on. 4.Users must be between 1. 45 and 1.95 meters tall.
However, it could be hard to make these rules work. Ou Jing is ofo’s manager in Shanghai. He said the company had banned (禁止) children under 12 from using its service. Yet, young children can still be seen riding ofo bikes. That’s because many ofo bikes use manual (手动的) locks. 5.Ofo has developed electronic locks. However, it will take some time for the company to fix the new locks on all of its bikes.
Most of you are old enough to ride a shared bike. Still, please ride slowly for your own safety. When you finish using the bike, don’t forget to park and lock it properly—for everybody’s safety.
根据短文内容, 从方框中选出五个句子填入文中空缺处,使短文内容通顺完整。
A. If a user doesn’t lock the bike properly after using it, anyone can ride it away.
B. In fact, they are popular not only among adults but also among teens.
C. All of the children under 12 have stopped riding ofo bikes.
D. Besides, the boy was considered too young to ride a bike.
E. For example, only people aged between 12 and 70 can ride shared bikes.
F. These accidents warn us that shared bikes are not for everybody.
九年级英语补全短文6选5中等难度题查看答案及解析
—What do you think of this question?
—You see, the question was by the teacher and only Tom to answer the difficult question.
A.raised, rose B.raised, raised C.risen, rose D.risen, raised
九年级英语单选题中等难度题查看答案及解析
根据中文或首字母写出单词，使句子完整准确。
1.What he said was already(记录) by the police.
2.Congratulations! You’ve answered all the questions(正确地).
3.Mr Wu received a present from his friend, but he didn’t a_____________ it..
4. The camera was one of the greatest _____________(发明)in the world.
5.You have to be p___________ enough to wait for your turn.
6.Now people eat______________ (health) than before and many of them pay much attention to doing sports after work.
7.The boy__ (take) to hospital at once after he fell off the tree.
8.we must do what we can________(save) the girl. She is too young.
9.We hope that more charity shows__ (hold) to raise money for Project Hope.
10. The boy considered ________(he) as the smartest boy in his class.
九年级英语单词拼写中等难度题查看答案及解析