出血热病毒的主要中间宿主是（）
A.幼猪
B.家禽
C.鼠类
D.鸟类
E.恙螨
参考答案：C
The little girl has to write a _______ composition every week. [ ]
A. two-thousand-word
B. two-thousands-word
C. two-thousand-words
D. two-thousands-words
CNG加气子站内无固定储气设施时，站内停放的车载储气瓶组拖车并应多于（）辆。
A.1
B.2
C.3
D.4
