短文填空 (注意适当形式)
bring, different, eat, food, hamburger, kind, like, love, turkey |
To many people, American food means____ , hot dogs and fried chicken. If you like sweet (甜的)____ , you may even think of apple pies (苹果派) or chocolate cookies (曲奇饼干). It's true that Americans often____ hese things.
It's hard to find another traditional American food except (除.....之外) Thanksgiving ____ . The United States is a land of people who come from____ countries. When the people come to America, they____ their cooking styles with them, too. So in America you can find other countries'____ . For example, they____ Italian pizzas, Mexican tacos and Chinese egg rolls. However, these foods in American aren't quite____ the original (原先的) ones in other countries.
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行入射到三棱镜上，经棱镜折射后，交会在屏上同上点，若n1和n2分别表示三棱镜对红光和蓝光的折射率，则有：（ ）