能减小远中游离端义齿的基牙扭力的卡环是（）
A.RPI卡环
B.圈形卡环
C.对半卡环
D.杆形卡环
E.回力卡环
参考答案：A
一种股票上半年跌了20%，下半年要涨______%才能够本．
_____of danger in the street at night, she had to go home, with a friend_____ her.
A．Warned; accompanied
B．Warning; accompanying
C．Having warned; accompanied
D．Having been warned; accompanying
