Did you ever wonder how some of your favorite foods, products or toys came about? Believe it or not, they may have been an accident, or a failure of some other intention. Below, we found three mistakes we’re thankful for turned out to be what they are.

1. Most historians hold that the Chinese invented fireworks in the 9th century when they discovered how to make gunpowder. Story has it that a Chinese cook accidentally mixed together what were then considered common kitchen items and noticed they burnt. When put tightly(紧紧地)in a bamboo tube(管子and lit, it blew up.

2. In May of 1886, a law led John Pemberton, a pharmacist(药剂师), to rewrite the formula(配方) for “Pemberton’s French Wine Coca”, his popular headache treatment. Containing sugar instead of wine as a sweetener, the outcome became something for Coke, which was later mixed with carbonated(碳酸) water. His bookkeeper suggested the name Coca-Cola because he thought the two C’s would look good together, which is how what we call Coca-Cola, a world-wide drink came into being.

3. During World WarⅡ, scientists at the University of Birmingham invented the magnetron(磁控管)—an important heat-producing part of the microwave oven. While working for Raytheon Corporation after the war, the American engineer Percy Spencer was testing the magnetron when a chocolate bar in his pocket melted. He went on to test other foods including popcorn kernels(仁), and found it to be a much more efficient way to cook. In 1947 Raytheon came out with the first restaurant microwave oven, which was six feet tall and weighed 750 lbs.

1.The underlined phrase “ blew up” might mean _______ in Chinese.

A. 爆炸 B. 膨胀 C. 升华 D. 蒸发

2.Percy Spencer found the microwave efficient in cooking when he was ________.

A. looking for a way to melt his chocolate

B. trying to know tow a magnetron could cook

C. working to know how the magnetron works

D. asked to invent a restaurant microwave oven

3. The right time order of the three inventions should be ________.

A. fireworks, the microwave and Coca-cola

B. fireworks, Coca-cola and the microwave

C. Coca-cola, fireworks and the microwave

D. the microwave, Coca-cola and the fireworks

4.What can we learn from the above invention stories?

A.Experiments makes great inventors of our time.

B. Nothing is impossible if one tries each day.

C. Inventors come out of hard work at any time.

D. A small incident may lead to a great invention.

5.What’s the best title for the passage?

A. What great inventions they are!

B. Inventions from Three Countries.

C. Stories of Accidental Inventions.

D. The Human Inventions of time.

If your mother told you to eat carrots so you’d be able to see in the dark, she was right. It turns out that feeding kids carrots is just one of a number of things to keep eyes healthy. Other things include regular eye exams, and sunglasses or hats are also very helpful, experts say.

While eye disease is sometimes hereditary(遗传的), some are still preventable(可预防的), said Dr. Ron Weber, an Atlanta-based ophthalmologist. For example, nearsightedness, “not only has a genetic(基因的) component but is also influenced by how kids use their eyes during childhood,” he told Reuters Health by phone.

He said that extended close work, such as reading, has long been thought to cause nearsightedness. Recent support has come from a study in which people with a higher level of education were more likely to have nearsightedness, because they spend more time reading or working on computers. Another study showed that children who spend more time outdoors are less likely to become nearsighted.

But these findings don’t mean kids should be stopped from reading or working on the computer. Instead, Weber suggests, make sure a child’s environment is bright enough while they are doing close work. Parents should also help kids get into the habit of holding their reading material at the perfect distance – about 18 to 22 inches, he said. Finally, taking a break every five minutes or so, to let the eyes relax and focus on an object in the distance, will also help.

One of the most important things a parent can do to help head off eye disease and vision problems is to make sure their child gets regular eye exams, beginning early in life. “The majority of vision problems in children are preventable and treatable,” said Dr. Ida Chung.

1.What does the writer want to tell us in the passage?

A. It is important to keep your eyes healthy.

B. People seldom pay attention to eye health.

C. It is necessary to give your kids carrots.

D. All the eye disease are hereditary.

2.Which one is good for our eye health according to the third paragraph?

A. Spend more reading on computers.

B. Spend more time indoors.

C. Spend more time doing outdoor activities.

D. Spend more time working on computers.

3.The underlined part in the last paragraph means__________.

A. treat B. stop C. cover D. increase

4. Which can be the BEST title for this passage?

A. Eating carrots

B. Eye disease

C. How to keep eyes healthy

D. The importance of eye health.

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