现代人类错胎约占
A．35%
B．48.9%
C．50%
D．70%
E．45%
参考答案：B
How do you want to _______ this difficult problem? [ ]
A. do with
B. deal with
C. deal of
D. do of
下列物质中能使石蕊由蓝变红的是（）。
A.CH3CHO
B.CH3COOH
C.CH3CH2OH
