题型:阅读选择 题类:常考题 难易度:困难
浙江省台州市书生中学2019届九年级下学期英语第一次月考试卷
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!
Morpher People refuse to wear helmets(头盔) because they're thick and heavy. Morpher is a bike helmet made of plastic. It is just as strong as traditional helmets, but it can be folded almost completely flat, making it easier to carry. Morpher may be available for sale in stores in the near future. | HyperAdapt Have you ever seen the movie Back to the Future? Maybe everyone wants the pair of shoes in the movie that can tighten or loosen by themselves. Now, thanks to the Shoe Factory , the dream is realized. When you push a button on the shoe, HyperAdapt can tighten or loosen around the feet. |
Flyte Flyte is a light bulb that can float (漂浮)and turn. Flyte has been popular with most people since it came out in January. The company also introduced a lot of similar products, including a planter, Lyfe, which came out in June. | Little Printer It looks lovely and is called Little Printer. This machine can print news headlines (摘要) , riddles and other things on a roll(卷)of paper. If you want to make your own little newspaper, don't forget to use it. |
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