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Where do our favorite foods come from? The truth may【C1】______you. Did you know curry(咖喱)isn’t Indian? Did you know Americans weren’t the【C2】______to eat hamburgers? Or did you know pizza wasn’t created in Italy?
First, let’s talk about curry. Many people think the English found out about curry from people in India in the 1600 s. But【C3】______, wealthy English people were cooking with curry spices hundreds of years【C4】______British ships traveled to India. In fact, the word “curry“ can be found in the English language as far back as 1377. Cooks of wealthy English families created curry dishes, and later these【C5】______caught on in other parts of England.
【C6】______pizza, this dish was probably first made in Persia(what is now Iran). The Persians were eating round, flat bread with cheese in the 500s—nearly one thousand years before pizza caught on in Naples, Italy!
Finally, let’s look at the truth behind【C7】______Many people think hamburgers are an American food. However,【C8】______some stories, hamburgers came from Hamburg, Germany. A German named Otto Kuasw made the first hamburger in 1891. Four years later, German sailors【C9】______hamburgers to Americans.
Where foods come from isn’t nearly as【C10】______as how they taste—delicious! So, go get some of your favorite food and dig in.
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I have been very lucky to have won the Nobel Prize twice. It is, of course, very exciting to have such an important【C1】______of my work, but the real pleasure was in the work itself.
Scientific research is like an exploration of a voyage of discovery. You are【C2】______trying out new things that have not been done before. Many of them will lead【C3】______and you have to try something different, but sometimes the experiment does【C4】______and tells you something new and that it really exciting.【C5】______small the new finding may be, it is great to think “I am the only person who knows this“ and then you will have the fun of thinking what this finding will【C6】______and of deciding what will be the【C7】______experiment.
One of the best things about scientific research is that you are always doing something different and it is never【C8】______. These are good time when things go well and the bad times when they【C9】______Some people get discouraged at the difficult times, but when I have a failure my policy has always been not to worry but to start planning the next experiment, 【C10】______is always fun.
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Fueled by weather, wind, and dry undergrowth, uncontrolled wildfires can burn acres of land—and consume everything in their way—in mere minutes.
【C1】______, more than 100, 000 wildfires clear 4 million to 5 million acres of land in the U. S. every year. A wildfire moves at speeds of up to 23 kilometers an hour, consuming everything— trees, bushes, homes, even humans—in its【C2】______.
There are three conditions that need to be【C3】______in order for a wildfire to burn: fuel, oxygen, and a heat source. Fuel is any material【C4】______a fire that will burn quickly and easily, including trees, grasses, bushes, even homes. Air supplies the oxygen a fire【C5】______to burn. Heat sources help spark the wildfire and bring fuel to【C6】______hot enough to start burning. Lightning, burning campfires or cigarettes, hot winds, and even the sun can all provide【C7】______heat to spark a wildfire.
【C8】______often harmful and destructive to humans, naturally occurring wildfires play a positive role in nature. They【C9】______nutrients to the soil by burning dead or decaying matter. They remove diseased plants and harmful insects from a forest ecosystem(生态系统). And by burning【C10】______thick trees and bushes, wildfires allow sunlight to reach the forest floor, enabling a new generation of young plants to grow.
