地面涂料的基本要求不包括( )。
A．耐碱性良好
B．耐水性良好
C．耐磨性良好
D．透气性良好
参考答案：D
One of a layer's tasks is to _____ legal guidance to people in need but a certain _____ of fee is charged. [ ]
A. supply;number
B. provide;deal
C. askfor;amount
D. offer;amount
简述人口问题的尖锐化及其症结。
