A．He cooks for the club members quite often.B．He wasn't careful when he was preparing
A. He cooks for the club members quite often.
B. He wasn't careful when he was preparing food.
C. He often fills the kitchen with tomato and chocolate.
D. He doesn't like to prepare food for the club members.
查看答案
A．Cousins.B．Aunt and nephew.C．Niece and uncle.D．A client and a secretary.
A. Cousins.
B. Aunt and nephew.
C. Niece and uncle.
D. A client and a secretary.
劳务报酬收入一次性超过20000元的应加成征税。()
A. 正确
B. 错误
在骨骼肌兴奋一收缩耦联中起关键作用的离子是
A. Na+
B. K+
C1-
D. Mg2+
E. Ca2+
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