雌三醇测定的目的是了解
A．胎儿胎盘功能
B．胎儿宫内发育情况
C．胎儿肝脏成熟情况
D．胎儿皮肤成熟情况
E．胎儿肾脏成熟情况
参考答案：A
—Your mother becomes more and more forgetful.
—Yes. She searched for her cellphone for a whole day last Sunday but it ___ in her coat pocket the next day.
A．turned out
B．turned on
C．turned over
D．turned up
投篮出手用力是指投篮时身体各部位综合、协调的用力过程。它是整个投篮动作的（）环节。
A.基本
B.辅助
C.关键
D.唯一
