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】______, ba

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

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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 of 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.
【C18】
选项 A、when
B、since
C、before
D、after
答案B
解析 本题考查since用于完成时的用法。根据题意，酒精的销量自从饮酒年龄限制被上调以后不减反增，所以答案为B。
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