已知抛物线y2=2px（p＞0）上一点M（1，m）（m＞0）到其焦点的距离为5，双曲线 x2a-y2=1的左顶点为A，若双曲线的一条渐近线与直线AM平行，则实数a的值是（ ）
碘是人体必需的元素,但摄碘过量可致多种甲状腺病。卫生部《食用盐碘含量》标准明确指出,从2012年3月15日起,食用盐碘含量将不再“一刀切”,各地可以根据当地人群实际的碘营养水平,在规定范围内浮动添加。这体现了（ ）
①在矛盾普遍性原理的指导下研究矛盾的特殊性 ②矛盾的特殊性寓于普遍性之中 ③真理的具体性、条件性 ④办事情要把握一定的“度”
Inventions make the world better, smarter and a little more fun.
The folding bike helmet (头盔)
People hate to wear a helmet because it's thick and heavy. Morpher is a bike helmet made from plastics. It is just as strong as the traditional ones, but flexible (灵活的) enough to fold almost totally flat. Also it is much easier to carry.
Shoes that tie themselves
After we see the movie Back to the Future, almost everyone wants a pair of self-tying shoes. Now, thanks to Nike, the shoe dream comes true. When you press a button, the shoes can tie themselves.
The smart alarm clock—Hello Sense
An alarm clock, called Hello Sense, can improve your sleep. It can control the temperature, light and even air quality in your bedroom to help you have a perfect sleep environment. And it can record your sleep cycles.
Sweet potatoes that could save lives
The lack (缺乏) of vitamin A can cause blindness and many other illnesses for illnesses. In sub-Saharan Africa, plant experts are helping them grow a kind of new sweet potatoes. These potatoes can help them fight against some illnesses.
