兔瘟的病原是（）
A.圆环病毒Ⅱ型
B.胸膜肺炎放线杆菌
C.密螺旋体
D.兔病毒性出血症病毒
E.溶血性大肠杆菌
参考答案：D
--- Thank you for your coffee . I’m afraid I have to go now.
---Ok. ___________.
A．Go slowly
B．All right.
C．Sounds great
D．See you.
Nowadays we students are so busy that we don’t have much time for outdoor sports activities, _______we have the interest.
A．wherever
B．whenever
C．even if
D．as if
