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

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

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（）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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