单项选择题

（）learning has a lot to do with your hard work.

A.successful
B.succeed
C.success
D.succe

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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
单项选择题
（）the grand city was a small village ten years ago.

A.That is now
B.Which is now
C.What is now
D.All is now
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