充足的睡眠对健康很有益处,成人每天需要几小时睡眠()
A、5-6小时
B、7-8小时
C、9-10小时
D、11-12小时
参考答案:B
下列厌氧菌中不是人体正常菌群的是()
A.无芽胞革兰阳性菌
B.无芽胞革兰阴性杆菌
C.无芽胞革兰阴性球菌
D.破伤风梭菌
E.艰难梭菌
— It angered me that a neighbour accused me _____ kicking her pet.
— Oh, you had the right to defend yourself _____ her accusation. [ ]
A. of; against
B. for; from
C. against; for
D. for; against