下列哪项不是婴儿期的保健重点()
A.保温
B.定期体检
C.早期教育
D.预防接种
E.加强户外活动和体格锻炼
参考答案:A
There is no doubt ________ those who work hard will succeed sooner or later.
A.if
B.whether
C.why
D.that