下列嘌呤核苷酸之间的转变,哪项是不能直接进行的()
A.AMP→IMP
B.GMP→IMP
C.AMP→GMF
D.IMF→XMP
E.XMP→GMP
参考答案:C
一台电脑标价6000元,电脑公司九折销售,购买一台电脑需要花( )元.
This is the best way I could think of ______ him ______ computer games.
A.to stop; playing
B.stopping; playing
C.stop; to play
D.stopping; to play