已知集合A={-1,1,2,4},B={-1,0,2},则A∩B=( )。
{-1,2}
—This is Lucy speaking, ?
—This is Bill.[ ]
A. who are you
B. who's that
C. are you Bill
D. who is he
儿童期最常见的肾肿瘤是()
A.肾细胞瘤
B.多囊肝合并多囊肾
C.肾母细胞瘤
D.肾错构瘤
E.肾畸胎瘤