A. by educating its citizens B. by developing TV programmes C. by careful family planning D. by chance 参考答案:D 答案解析:就巴西降低了人口增长速度,文章在第一段明确地给出了原因"Brazil has become one of the developing world's great successes at reduc
第16题: [单项选择]while和do-while循环的主要区别是( )。 A. do-while的循环体至少无条件执行一次 B. while的循环控制条件比do-while的循环控制条件更严格 C. do—while允许从外部转到循环体内 D. do-while的循环体不能是复合语句 参考答案:A