按照“三缺口模型”，一国利用外资可以填补（）等三个缺口。
A.技术缺口
B.资源缺口
C.储蓄切口
D.外汇缺口
参考答案：A, C, D
Obama’s years in Indonesia were unforgettable for some of his former schoolmates _____ his teachers.
A．as well as
B．as far as
C．together with
D．along with
污水管道系统的控制点一般不可能发生在______的位置上。
A．管道的终点B．管道的起点C．排水管道中某个大工厂的污水排出口D．管道系统中某个低洼地
