13.指出下列语句中,①直角大于锐角;②∠AOB是钝角?③∠1+∠2=90°,那么∠1与∠2互为余角;④两条平行线不相交.是命题的是( )
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| A. | ①②③ | B. | ①②④ | C. | ①③④ | D. | ②③④ |