题目

为了了解全校1740名学生的身高情况，从中抽取140名学生进行测量，下列说法正确的是（    ）   A. 总体是1740          B. 全体是每一个学生    C. 样本是140名学生     D.样本容量是140 答案：D Faced with a bill for$ 10,000, ________． [　　] A．the boss has given john an extra job B．John has taken an extra job C．an extra job has been taken D．an extra job has been given to John