轻度精神发育迟滞时，智商为（）
A.30～49
B.50～70
C.20～34
D.<20
E.75～89
参考答案：B
She is very dear to us. We have been prepared to do ______ it takes to save her life.
A．whichever
B．however
C．whatever
D．whoever
列车反方向运行
