神经母细胞瘤的标志物是（）。
A.APT
B.NSE
C.AFU
D.AFP
E.PAP
参考答案：B
He always eats much food, so he is_______heavy.[ ]
A. a lot
B. so many
C. a bit of
D. a little bit
濒临三大洋的大洲是[ ]
A．亚洲
B．非洲
C．南美洲
D．欧洲
