用于经会议讨论通过的重要决策事项的文种是( )
A．意见
B．决议
C．会议纪要
D．会议记录
参考答案：B
若x、y是有理数，设N=3x2+2y2-18x+8y+35，则N[ ]
A.一定是负数
B.一定不是负数
C.一定是正数
D.N的取值与x、y的取值有关
—I can't find my mobile phone. I'm sure it's in this room.
—_________. I'll call you with my phone. When it rings, you can follow the sound. [ ]
A. Excuse me
B. Good luck
C. Thank you
D. Don't worry
