A、50
B、52<img width="19" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-23/94c178e3-1c19-420c-84ee-da1ebc7beb20.png" />
C、53
D、55<img width="19" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-23/94c178e3-1c19-420c-84ee-da1ebc7beb20.png" />
B、52<img width="19" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/2d418152-9c83-44a1-85ec-64f039722a9c.png" />
D、55<img width="19" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/2d418152-9c83-44a1-85ec-64f039722a9c.png" />
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