下列有关家蚕的生殖的说法正确的是[ ]
A．雌雄同体
B．体外受精
C．无性生殖
D．有性生殖
答案：D
Han Mei, I would appreciate ______ you could give me some suggestions on GRE test.
A．it whether
B．it if
C．that when
D．that if
与皮肤弹性无关的是
A．营养状态B．年龄C．组织间隙的液体量D．种族E．皮下脂肪
