在哪一时期，山水画、花鸟作为独立画科蓬勃发展起来（）
A、隋唐
B、唐宋
C、宋元
D、明清
参考答案：B
(2013·厦门模拟)“Youth”is regarded by many people as a time in their life
fun, passion, and imagination seem limitless.
A．that
B．which
C．when
D．where
体育作为一种社会现象但它不是社会实践的产物。
