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【单选题】
已知下列命题：①同位角相等；②若a＞b＞0，则 1 a ＜ 1 b ；③对角线相等且互相垂直的四边形是正方形；④抛物线y=x 2 -2x与坐标轴有3个不同交点；⑤已知一圆锥的4，母线长为5，则该圆锥的侧面积为15π．从中任选一个命题是真命题的概率为（ ）A.
1 5
B.
2 5
C.
3 5
D.
4 5
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【单选题】In my opinion, hard work is as important as, ______ an efficient way in study. [ ]
A.
if not as important than
B.
if more important than
C.
if not more important than
D.
if as important as
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