为预防佝偻病，孕妇及乳母应每天接受1小时以上的日光照射。
参考答案：对
两个乘数相乘积是250，一个乘数不变，另一个乘数扩大100倍，积是______．
Although the working mother is very busy,she still a lot of time to her children. [ ]
A.devotes
B.spends
C.offers
D.provides
