语法与词汇
Because medicine has reduced infant mortality and natural death sosignificantly, the population has been rising steadily, in spite of serious effort_____ the rate of population.
【正确答案】
B
【答案解析】句意：医疗水平进步很快，婴儿死亡率和自然死亡率大大下降，所以人口增长很快，尽快我们已经尽了很大努力降低人口增长率。本题考查的是effort的用法。take effort to do意为“努力做某事”。