—How are you?
—__________fine, thanks.[ ]
A. I
B. am
C. I'm
D. Am
答案:C
Who wants ______ the swimming club?[ ]
A. to joins
B. join
C. to join
引起严重急性呼吸综合征(SARS)的病原体是
A.肺炎衣原体
B.军团菌
C.肺炎支原体
D.副黏病毒
E.新型冠状病毒