饲料中真正能够被动物利用的能量是（）.
A.GE
B.NE
C.DE
D.ME
参考答案：B
______ their homework, these three students have to stay in the classroom for another thirty minutes.
A．Not finishing
B．Not finished
C．Having not finished
D．Not having finished
生殖器疱疹是：（）
A.人 * * 状瘤病毒引起
B.单纯疱疹病毒Ⅰ型引起
C.单纯疱疹病毒Ⅱ型引起
D.淋球菌引起
E.支原体
