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【单选题】
下列说法中,正确的有( ) 1无限小数是无理数; 2无理数是无限小数; 3两个无理数的和是无理数; 4对于实数 a 、 b ,如果 a 2 = b 2 ,那么 a = b ; 5所有的有理数都可以用数轴上的点来表示,反过来,数轴上的所有点都表示有理数.A.
②④
B.
①②⑤
C.
②
D.
②⑤
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