如果单项式2xn+1y与﹣3x2y2的次数相同,则(n﹣3)2009=( ).
﹣1
Don't call me tomorrow evening, for I _____to a lecture on how to keep a good state of mind when taking an exam. [ ]
A. will listen
B. shall listen
C. will be listening
D. should listen
理财规划首先应该考虑的因素是风险,而非收益。()