胎儿发育指数在-3和+3之间为正常，小于-3有胎儿生长受限的可能。
参考答案：对
Judging from _______ number of seats, ______ number of people were present at the meeting．
A．a; the
B．the; a
C．a; a
D．the; the
邮件发出之前及接收时或接收之后，均应根据相关清单逐件挑对以确保登单节目相符。（1分）
