第20题: [单项选择]6,18,( ),78,126 A. 40 B. 42 C. 44 D. 46 参考答案:B 答案解析:6,18,( ),78,126均为6的倍数,可写成1×6=6,3×6=18,( ),13×6=78,21×6=126。1,3,( ),13,21有二级等差数列的特征,其二级公差为2,括号内应为7
A. the city itself B. its inhabitants C. the buildings D. the markets 参考答案:B 答案解析:本题询问是什么真正让一座城市生机勃勃,相关语句为第一段的强调句型“it is the city's people who add that extra dimension which makes it