肠结核最好发于（）。
A.回盲部
B.空肠
C.降结肠
D.升结肠
E.十二指肠
参考答案：A
初生仔猪易缺铁而贫血。
With the aid of the scientists, more new facts about the sea will _______ gradually.
A．bright to light
B．come to light
C．see through light
D．giveout light
