⑴棱长为2的正方体 ⑵底面直径和高均为2的圆柱 ⑶底面直径和高
均为2的圆锥
下列能够遗传的变异是( )
①狗的不同毛色
②红绿色盲
③皮肤白化
④先天愚型
⑤无籽西瓜
⑥同品种、同质量的白菜种子,由于水肥条件不同,植株个头的大小不同.
填入所缺词语,完成下列短文
Dear Bob,
I have a happy family.I like(1)____ and(2)____ .But I don't like(3)____ .My father likes(4)____ and(5)____ .He doesn't like(6)____ .My mother likes(7)____ ,but she doesn't like(8)____ and(9)____ .And she wants me to drink(10)____ every day.
How about you? Please write to me soon.
Yours,
Alan
下列关于生命科学实验的描述中,正确的是( )