下列不属于佝偻病病因的是()。
A.胎中失养
B.先天不足
C.调理不当
D.外感风寒
E.后天亏乏
参考答案:D
— Where is your mother?
—She ________ the shop. She’ll be back in an hour.
A.has been to
B.has gone to
C.goes to
D.go to
下列图示实验装置或操作中正确的是( )
A.
B.
C.
D.