幼儿发育迟缓，主要责之于
A．肾精亏少
B．脾失健运
C．肝血不足
D．命门火衰
参考答案：A
Stephen Hawking believes that the earth is unlikely to be the only planet ________ life has developed
gradually.[ ]
A. that
B. where
C. which
D. whose
