衣原体与病毒相同的是()
A.专性细胞内寄生
B.能通过滤菌器
C.对抗生素敏感
D.能形成包涵体
E.含有两种核酸(RNA和DNA.
参考答案:A, B, D
Whenever you enter the reading room, you can find all the students _____ at their desks, with their attention
_____ on the books, except Tom. [ ]
A. sitting, fixing
B. to sit, fixed
C. seating, fixing
D. seated, fixed
直接投资