下列关于动物生殖发育的叙述正确的是( ) ①蝗虫的发育包括受精卵、若虫和成虫三个时期 ②果蝇的发育过程属于完全变态 ③青蛙的生殖和发育都离不开水 ④雏鸡属于晚成鸟,需要由亲鸟育雏 A.①②④ B.②③④ C.①②③ D.④①②In April,2009,President Hu inspected the warships in Qingdao,________ the 60th anniversary of the founding of the PLA Navy.A.marking B.marked C.having marked D.being marked