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　     Ashia Hansen is the world indoor triple jump (三级跳)record holder. She has given up getting a place in the Great Britain team for next weekend's European Indoor Championships（锦标赛）. Hansen, whose injured leg almost brought her career（事业） to an end three years ago, won the third prize at the Union Jumps International last Wednesday. “I could look for another competition, but it's pretty pointless（无意义的）. I just have not got enough speed to jump what I want to, ” says Hansen. She still wants to take part in this year's World Championships in Osaka. She says, “I can actually smile now because I know I have not lost anything in jumping ability. It's just that the speed is not there. I've now got three months to find that before the summer season starts. ”

课外阅读

       我一向喜欢贝壳，吵着要阿姨带我去拾贝壳，阿姨答应了。

我们来到海边，啊，这里的景色真美，浪花轻轻拍打着海岸，发出“哗哗哗“的响声；蓝色的海面上航行着小小的帆船和”突突突“的汽艇。我望着无边无际的大海，心情十分舒畅。

      在海滩上，我们卷起裤管，俯下身子，拾起贝壳来。这里到处是五颜六色的贝壳：有大的、小的、尖的、圆的、扁的、各种形状、各种色泽，真实千奇百怪。它们在阳光下闪闪发光。忽然，阿姨叫道：“小红，快来，这个贝壳多好看！“我跑过去一看，果真是一个好贝壳，它有小碗那么大，身上印着一条一条棕色花纹，和老虎身上的花纹一样。我急忙接过来，掏出手帕，小心翼翼地把它包好。

      渐渐地，小篮子装满了贝壳，我们高高兴兴地准备回家。离开海滩时，我不时回过头去，啊！我爱美丽的贝壳，我爱金色的沙滩，我更爱祖国蓝色的海洋！

已知集合A={x|x=a+(a²－1)i，a∈R，i是虚数单位}，若A$\subseteq$R，则a=(  )

艾滋病是人类社会最为关注的一种疾病，艾滋病的医学全名为”获得性免疫缺陷综合症”，它是由”人类免疫缺陷病毒”（HIV）引起的，如果同HIV感染者发生无保护的性行为，或者接受被HIV感染的血液，都可以感染上艾滋病，被感染的母亲也可能遗传给未出生的婴儿．引起艾滋病的病原体是____ ．这种病原体没有____ 结构，是由____ 外壳和内部的____ 组成．