垂直位移钮用来调整光迹或光点的（）位置
A、垂直
B、水平
C、亮度
D、扫描
参考答案：A
There is an obvious __________ between the cultures of the West and East.
A．content
B．contrast
C．contract
D．contact
Even to many scientists, the problems resulted from the conflict between economic gains and environmental protection are simply ______.
A. insoluble B. infallible C. inferable D. ineffable
