题目

Life is filled with challenges. As we get older we 36 realize that those challenges to the very things than 37 us and make us who we are ,it is the same with the challenges that come  with 38 . When we are fared with a challenge, we usually have two 39 . we can try to beat it off, or we can decide that the thing 40 the challenge isn’t worth the 41 and call it quits. Although there are certainly 42 when calling it quits it the right thing to do, in most 43 all that is needed is 44 and communicable. When we are communed to something, it means that no matter how 45 or how uncomfortable somet从集合{1，2，3，5，7，9，0，-4，-6，-8}中任取三个不同元素分别作为方程Ax2+By2=C中的A、B、C的值，则此方程能表示不同双曲线的条数是（ ）A．252B．288C．126D．36