驾驶员进行的每一个操作都可以概括为()个阶段。
A.1
B.2
C.3
D.4
参考答案:D
--- Would you like black or white coffee?
--- Well, I ______ coffee ______ milk.
A.prefer ; to
B.prefer; with
C.would rather; than
D.like; better
持久收入假说认为消费与经济的景气变化关系不大。