—Dad, could you buy me a computer like this?

—Of course, we can buy_________one than this, but_________it.

A．a better, better than

B．a popular, as good as

C．a more popular, not as good as

D．a cheaper, as good as

参与构成骶丛的脊神经是（）

A.腰骶干

B.骶神经前支

C.尾神经前支

D.第5腰神经前支一部分

E.第3腰神经前支一部分