以下有关神经管的叙述正确的是()。
A.神经管由神经板发育而来
B.神经管由神经嵴发育而来
C.神经褶细胞发育成为神经管
D.神经沟发育成为神经管
参考答案:D
太阳能热发电只能利用太阳能中的()资源,不能利用太阳能散射辐射资源。
What a beautiful dress in the window!()
A.I have no idea about it.
B.Yes, really. If I had the money, I‘d buy it.
C.You can‘t wear it.
D.There‘s no money to buy it