对于一个六次多项式，它的任何一项的次数[ ]
A．都小于6
B．都等于6
C．都不小于6
D．都不大于6
答案：D
David paused to consult his notes, and then _______ with his speech.
A．proceeded
B．pursed
C．pronounced
D．proposed
运动障碍不会造成
A．压疮B．关节挛缩C．忧郁D．睡眠不足E．便秘
