比较各年龄段的钙营养状况（）。

A．儿童优于成人

B．青少年优于哺乳期妇女

C．儿童优于哺乳期妇女

D．以上答案均不正确

Now a lot of new technologies can ___________ problems in industry.

A．be applied to solve

B．be applied to solving

C．apply to solve

D．apply to solving