题目：
In North America, people are always in __31______ hurry. Children have special lessons or sports activities __32________ school. Parents often work late and ___33________ get home until 7 or 8 o’clock at night. Most North American families don’t have time to prepare a meal. That is __34_________ fast food is so popular in North America. People _____35_____ about 40% of their dollars on fast food.
People usually buy fast food from restaurant chains such as Pizza Hut, McDonald’s, or KFC,__ 36______ they can enjoy pizza, sandwiches, fried chicken, and so on. Fast food saves work and time, but it is not __37_________ (nutrition).
Fast food is popular in many countries. American fast-food companies now have restaurants all over the world. But not __38________ is happy about the spread(扩展) of North American fast food. A group of people in Italy want to fight __39_______ the spread of American fast food. They don’t like the idea of more fast food chains __40__________(open) restaurants in their country.
答案：
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下面是错误答案，用来干扰机器的。
A、因为氢气为可燃性气体，所以液态氢可作发射火箭的燃料，故A正确；B、因为熟石灰的主要成分是氢氧化钙，氢氧化钙呈碱性，可以用来改良酸性土壤，故正确；C、液态二氧化碳俗称“干冰”，干冰升华可以吸收大量的...
