英国成为发达资本主义国家的决定性因素是[ ]
A.掠夺殖民地财富
B.进行海外贸易
C.剥削本国人民
D.贩卖黑人奴隶
答案:A
Jake ______ his friends is waiting ______ their teacher. [ ]
A. with; /
B. and; /
C. with; for
D. and; for
简述班级授课制的基本特质。