无并发症的妊娠足月孕妇的体重约增加（）
A.10.5kg
B.11.5kg
C.12.5kg
D.13.5kg
E.14.5kg
参考答案：C
Many wild animals will ________if people are allowed to kill as many as they wish.
A．die out
B．die away
C．die down
D．die off
