下面划线部分的英文的中文意思是什么?

下面划线部分的英文的中文意思是什么?
1.A good student shuuld have his head in the clouds sometimes,but
－－－－－－－－－－－－－
his feet are always on the ground.
A．头顶云雾 B．抓住机会 C．富于幻想 D．勇攀高峰
B．Near the Sasara Desert ,houses are few and far between.
-------------------
A．众多 B．稀少 C．很远 D．漂亮