【单选题】
由于幼儿的肌肉中水分多，蛋白质及糖原少，不适合他们的运动项目是( )。
①
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②
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③
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④
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【多选题】
下列关于动物生殖和发育的叙述，错误的是（）。
①
A.昆虫的生殖离不开水，精子和卵细胞在水中受精
②
B.雌雄蛙的抱对现象有利于受精卵孵化成蝌蚪
③
C.鸟类的繁殖行为是对复杂的陆地环境的适应
④
D.胎生、哺乳提高了哺乳动物的产仔率