受精卵开始进行细胞分裂的场所是 [ ]
A．输卵管
B．子宫
C．卵巢
D．胎盘
答案：A
两个真分数的积和它们的商比较[ ]
A．积大
B．商大
C．一样大
D．无法比较
You know _______. [ ]
A. what he happened
B. what did he happen
C. what happened to him
D. what happened him
