收入从企业的日常活动中产生,它不具有()。
A.经常性
B.重复性
C.可预见性
D.偶然性
参考答案:D
To celebrate the New Year, the students stayed in the classroom after school, _____ the performances and ______ the room.
A.practicing ; preparing
B.practiced ; prepared
C.to practise ; prepare
D.practicing ; prepared
滥用抗生素容易导致什么后果?