52÷(1+67),
=52÷137,
=52×713,
=28(岁);
答:小沈阳去年28岁.
如图表示蛙的发育过程,正确的发育顺序是( )
A.②→③→④→⑤→①
B.④→②→③→⑤→①
C.③→②→④→⑤→①
D.①→⑤→④→②→③
合纵与连横