一个西瓜中有100粒种子,则此西瓜在形成时需要的子房、胚珠、精子的数目分别是( )
A:1 100 100
B:100 100 100
C:1 100 200
D:100 100 200
—I want to buy the book Harry Potter. Do you know its ________?
—Not quite sure. Maybe 30 yuan.
下列关于人类遗传的叙述中,正确的是( )