(an+1)2•(a2)n-1等于( )
A.a4n+3
B.a4n+1
C.a4n-1
D.a4n
(an+1)2•(a2)n-1=a2n+2•a2n-2=a4n.
故选D.
—How about joining me for a cup of coffee?
—________, but I'm exhausted. I was up till 3 this morning, writing a paper.[ ]
A. You are welcome
B. Good idea
C. I can't agree more
D. I'd love to
老年人每天每千克体重蛋白质的摄入量应达到()。
A.0.8g
B.1.0g
C.1.2g
D.1.5g
E.1.8g