--- _________ are the books and the sweaters? ---They are 130 yuan.
A:How many
B:How much
C:How old
D:How long
一粒种子能长成参天大树,其主要原因是( )
在由正整数构成的无穷数列{an}中,对任意的n∈N*,都有an≤an+1,且对任意的k∈N*,数列{an}中恰有k个k,则a2016=____