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--Why are the windows so dirty?
--Because we_________them for a long time.
A. have cleaned B. haven't cleaned C. didn't clean
九年级英语单项填空中等难度题查看答案及解析
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﹣Why are the windows so dirty?
﹣Because we __________ them for a long time.
A. have cleaned B. haven’t cleaned C. didn’t clean
九年级英语单项填空中等难度题查看答案及解析
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﹣Why are the windows so dirty?
﹣Because we __________ them for a long time.
A．have cleaned
B．haven’t cleaned
C．didn’t clean
九年级英语单项填空中等难度题查看答案及解析
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-Why do you want to see the pandas?
-Because they are .
A.cute B.ugly C.thin D.dirty
九年级英语单项填空中等难度题查看答案及解析
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1——Why is the classroom so dirty?
——Sorry, Sir. It _____ yesterday. We forgot to do it.
A.doesn't clean B.didn't clean C.isn't cleaned D.wasn't cleaned
九年级英语单项填空中等难度题查看答案及解析
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—Why is the classroom so dirty?
—Sorry，sir. It________yesterday, We forgot to do it.
A．doesn’t clean B．didn’t clean
C．isn’t cleaned D．wasn’t cleaned
九年级英语单项填空中等难度题查看答案及解析
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—Why are there so many plants in your flat?
—I want them to________harmful gases because I just bought some new furniture.
A.take over B.take in C.take up
九年级英语单选题中等难度题查看答案及解析
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Some inventions are so useful, but seem so simple, that we wonder why no one thought of them long ago. Post-it Notes, the pieces of paper that you can fasten almost anywhere and then remove without leaving any sign that they were there, are an example of such an invention.
Post-it Notes were invented about twenty years ago by Art Fry, a scientist at 3M Corporation. The idea for the product came from a frustrating experience he often had while singing in his church choir. Fry used pieces of paper as bookmarks to mark the places in his book of songs, but these bookmarks were always falling out. He knew he needed a bookmark that would stay where he put it, but that he could remove without damaging the pages.
Around that time, Fry heard about a new adhesive (粘合剂) that a workmate, Dr. Spence Silver, had created. This adhesive was special because it was sticky, but not too sticky. It was strong enough to hold papers together, but weak enough to not tear the paper when it was removed. Fry saw that the new adhesive could help solve his bookmark problem. One morning, Fry put some of the adhesive on the edge of a piece of paper. Just as he hoped, it made a perfect bookmark.
A short time later, Fry realized that his new invention had even more uses than being a great bookmark. He came to this realization when he wrote a note on one of his new "bookmarks" and attached it to a report he was going to give to a workmate. Soon, co-workers were asking Fry for more samples of his invention so that they could use the new type of notes themselves.
Fry and some other people at 3M believed so much in the new product that they persuaded the company to give away thousands of the "sticky pieces of paper" for trial use(试用). When some salespeople at 3M went to offices and showed workers just how helpful the new type of notes could be, they immediately received many orders. As more and more people discovered how useful Post-it Notes could be, the product took off.
1.The invention of Post-it Notes showed that Art Fry________.
A. had a lot of knowledge
B. was very hard-working
C. was good at creative thinking
D. loved his job in the church
2.In what way did Dr. Spence help Art Fry?
A. They worked together and often discussed science.
B. His invention of a special adhesive made Art's invention possible.
C. He advised 3M Corporation to give away lots of Post-it Notes for trial use.
D. He worked together with Art by providing the new adhesive for Art.
3.The underlined phrase "took off" means_______.
A. started to leave the ground
B. disappeared from the market
C. had even more uses
D. became popular very quickly
4.The biggest advantage of Post-it Notes is_______.
A. it can stay anywhere and leave no sign when removed
B. it is very cheap to use
C. it is good to write notes on
D. it is very thin and beautiful
九年级英语阅读理解困难题查看答案及解析
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— Why do many people buy things online?
— Because most of them are on sale. The price is much ________.
A.cheaper B.lower C.higher
九年级英语单选题中等难度题查看答案及解析
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Tiny plants and animals live all around us. We cannot see them because they are so small, but they are everywhere.
They live in the soil, the air, and in rivers and oceans. They grow on mountains and in caves. Some live in the ice at the north and south poles; some live where it is very hot. They are found throughout cities and in the country. They grow on other plants and animals. Some are even living on you, on your skin, hair, and inside your body, in your mouth, nose, and all through your intestines (肠).
These tiny plants and animals are called microbes. The word microbe is made from two other words: micro, meaning small, and bios, meaning life. So, microbe means small life.
Microbes have been on earth for a very long time. They may have been the first forms of life to be alive. Today there are more microbes in the world than all other living things.
People did not know microbes had existed (存在) long. They were too small for them to see.
But people did see many changes in their world—important changes. And they did not know what caused them. They saw food that they kept too long change color and begin to smell bad. They saw cuts and wounds grow red and painful and become infected. They saw old plants and leaves and trees crumble apart on the forest floor and disappear into the soil. Such changes were a natural part of the world, but people did not understand them. They did not know these changes were evidence (证据) of tiny plants and animals growing all around them.
1.Where do microbes live?
A. Only in the forest., B. Almost everywhere.
C. Most in very hot areas., D. Most in rivers and oceans.
2.The underlined phrase “crumble apart” in the last paragraph means “________”.
A. 开花结果, B. 化为春泥, C. 破裂腐烂, D. 芳香四溢
3.According to the passage, which is the most suitable to complete the web below?
A. Microbes are very small, B. Microbes are all around us
C. People can’t see microbes, D. Food begins to smell bad
4.The best title of the passage could be ________.
A. The smallest life around us, B. The origin (起源) of microbes
C. The place of microbes growing, D. The evidence of microbes growing
九年级英语阅读单选简单题查看答案及解析