—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
