单纯随机抽样
参考答案：
也称简单随机抽样，是最简单、最基本的抽样方法。是指所有抽样的基本单位有同样的概率被抽取的抽样方法。
Could you tell me_____? [ ]
A. who can help us organize the show
B. how long you have bought the car
C. what was your favourite subject
D. how many students are there in your class
新鲜酵母储存的最佳温度应为（）
A.-10～0℃
B.2～10℃
C.11～20℃
D.21～27℃
