阿肯弹唱有两种形式:一是()二是()。
参考答案:阿肯怀抱冬不拉自弹自唱,对唱
—Mum, I hope we can spend our holiday abroad this year.
—______ I’m too busy to take a trip abroad.
A.Better forget it.
B.Why not?
C.It couldn’t be better
D.Good idea!
简述胃穿孔的X线征象。