第16题: [单项选择]I don’t think the poor ______ always poor. Working hard ______ very important. A. is; is B. are; are C. are; is D. is; are 参考答案:C 答案解析:[解析] the poor表示穷人一类的统称,谓语动词用复数形式。而working hard表示一件事,谓语应该用单数形式。故本题选C。
参考答案:The areas of large population/large population centers 答案解析:这是关于流行病爆发地点的题目。由文章Prevention & Treatment for Diseases这部分第三段第一句"Epidemics usually start in areas of l