聚落的主要形式包括[ ]
A．乡村和牧区
B．工厂和矿区
C．教堂和寺庙
D．乡村和城市
答案：D
.I think _________ of the materials I listened to at the beginning of the exam ____ easy.
A．three fourths; is
B．third four; are
C．three fourths; are
D．third fourth; are
铣削用量有那些？
