如果只是引弧时使用髙频振荡器，因（）
A.时间较长
B.时间较短
C.影响较大
D.影响较小
参考答案：B, D
I don't usually like staying at ______ hotels, but last summer we spent a few days at ______ very nice hotel by the sea.
A．the; a
B．the; the
C．/; the
D．/; a
