For the engine to work, the green button

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问题选择题

For the engine to work, the green button be in the “on” position.

A．can

B．would

C．must

D．might

答案

答案：C

考查情态动词。Can能，可能；would将要，愿意；must必须，一定；might可能，也许。句意：为了机器能工作，这个绿色的按钮必须在“on”的位置。故选C。

选择题

Though winters in Britain are cold and there is usually snow, there are ________ places for skiing.

A．some

B．many

C．few

D．a few

单项选择题

（）有利于低硅冶炼。

A、高压操作

B、提高喷吹量

C、降低炉渣碱度

D、富氧鼓风