阿米巴病是由()感染引起，()污染食物和水，()是主要传播途径。
参考答案：溶组织内阿米巴‖阿米巴包囊‖经口感染
We could have asked someone to carry out the plan privately without it ________.[ ]
A. was known
B. knows
C. being known
D. be known
中国古典舞《新婚别》是由谁创作的？（）
A.栗承廉、林阿梅
B.戴爱莲、陈维亚
C.陈爱莲、冼源
D.陈泽美、邱友仁
