泡沫泥浆
参考答案：
气体（空气和天然气）和粘土均匀而稳定地分散在水中形成的水基泥浆。
They won’t buy new clothes because they＿＿money to buy a color TV set.
A．save
B．are saving
C．has saved
D．were saving
_____ does he go to school on weekdays? [ ]
A. What
B. What time
C. Why
D. What about
