“学生能够运用小儿营养计算法，正确地为特定年龄和体重的儿童计算食物摄入量”这一目标属于认知层次的______

A．知识层次
B．理解层次
C．应用层次
D．分析层次

Seeing the road__________with snow,we had to spend the holiday at home,watching TV.

A．blocking

B．to block

C．blocked

D．to be blocked