发达国家在国际服务贸易中一直处于绝对优势，约占全球服务进出口总额的( )
A．65%以上
B．70%
C．75%以上
D．90%
参考答案：C
—Would you like to the discussion this Saturday?
—Sorry, I have an important meeting to .
A．attend; join
B．join; attend
C．join; take part in
D．join in; attend
镍合金中镍含量为（）。
A.10%~99%
B.50%~99%
C.30%~99%
D.60%~99%
