口腔单纯疱疹的致病病原微生物是
A.细菌
B.真菌
C.病毒
D.支原体
E.衣原体
参考答案:C
— Would you like to play bridge with us?
— Sorry.___________. [ ]
A. With pleasure
B. No problem
C. It isn't my cup of tea
D. It is a piece of cake
The plant products have been carefully inspected and are considered to be ( ) from any quarantine pests.
A.out B.away C.free D.far