第23题: [单项选择]Unless the population growth stabilizes, environmentalists predict a worldwide starvation by the next decade. A. famine B. shortage C. rebellion D. infection 参考答案:A 答案解析:famine饥馑;shortage短缺;rebellion叛逆:infection传染、感染。因为stavation意为“饥饿”,故选A项。
第31题: [单项选择]As early as 1647 Ohio made a decision that free, tax-supported schools must be established in every town ______ 50 households or more. A. having B. to have C. to have had D. having had 参考答案:A 答案解析:现在分词having作后置定语,修饰前面的名词every town,因此选A。