下列有关艾滋病传播途径的叙述，错误的是（）
A.性接触
B.注射
C.母婴传播
D.器官移植
E.消化道
参考答案：E
, I lost heart in English learning, but my teacher often said to me, "Keep on studying hard ,
and you'll succeed ."[ ]
A. At one time; in time
B. At one time; on time
C. At a time; in time
D. At a time; on time
有一群小孩，他们中任意5个孩子的年龄之和比50少．所有孩子的年龄之和是202，则这群孩子至少有( )人．
A．18
B．20
C．19
D．21
E．(E) 23
