2. 外语
  3. The United States is a confederation of states．Each state has the【C1】______to make laws with regard to the state．【C2】______, bas

The United States is a confederation of states．Each state has the【C1】______to make laws with regard to the state．【C2】______, bas

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问题     The United States is a confederation of states．Each state has the【C1】______to make laws with regard to the state．【C2】______, based on public opinion，states can【C3】______policies regarding education, and they may【C4】______a state income tax; they also determine the speed【C5】______, housing codes and the drinking age．
    In most parts of the United States, you【C6】______be 21 years old to buy alcohol in a liquor store, bar【C7】______restaurant．In some states you may buy beer in a grocery store．If a store sells alcohol to a minor, the【C8】______of the store is usually【C9】______a large sum of money．
    【C10】______many areas have an open-container law,【C11】______means that people may not drink alcohol on the street or in a car．Anyone【C12】______with an open container of alcohol may be arrested．
    【C13】______with all these laws, the【C14】______of alcohol is a serious【C15】______in the United States and Canada．Drinking on college campuses,【C16】______there are many underage drinkers, has【C17】______greatly．In fact, alcohol sales have gone up【C18】______the legal drinking age was【C19】______from 18 to 21．Some people believe that if there were no legal drinking age,【C20】______in some other countries, North American youth would drink less．
【C6】
选项 A、can
B、shall
C、may
D、must
答案D
解析 情态动词词义辨析。can表可能性或能力，shall用在第一人称后表示 建议，may表示请求和许可。句意为“大部分州规定必须年满21周岁才可以在商店、酒吧或是餐馆买酒”，也就是说，法律严令禁止，must表某事的 必要性，符合句意，故选[D] 。
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