单项选择题
A.successfulB.succeedC.successD.succe
线粒体DNA遗传的特点是（）。A.X连锁显性遗传B.X连锁隐性遗传C.Y连锁遗传D.母系遗传E.共显性遗传
单项选择题线粒体DNA遗传的特点是（）。
A.X连锁显性遗传B.X连锁隐性遗传C.Y连锁遗传D.母系遗传E.共显性遗传
（）the grand city was a small village ten years ago.A.Th...
单项选择题（）the grand city was a small village ten years ago.
A.That is nowB.Which is nowC.What is nowD.All is now
He has to go to Canada for the next（）of his training.A....
单项选择题He has to go to Canada for the next（）of his training.
A.stepB.standC.pointD.stage
