A:shall
B:will
C:would
D:could
如图是某一个湖的能量金字塔,相关描述不正确的是( )
等比数列{an}中,其公比q<0,且a2=1-a1,a4=4-a3,则a4+a5等于( )
2×6=____ 6×1=____ 3×6=____ 4×6=____ 6×5=____