康有为在《上清帝第五书》中说：“若诏旨一下，天下雷动，士气奋跃，海内耸望……如是则庶政尽举，民心知戴。”从中可以得出维新派(  )

已知集合$A=\left\{1,2,3,4,5\right\},B=\left\{\left(x,y\right)|x\in A,y\in A,x-y\in A\right\}$,则B中所含元素的个数为(  )

    According to a new Ministry of Education (教育部) survey, student safety has become a big problem. Nearly 50 percent of students say they are worried about robbery on the way to and from school. Now in many big cities in China, some school has taught an unusual lesson: self– protection. Students like this lesson as there are no exams or boring classes. And they can learn how to save lives and know how to stop danger before it really happens.
    Chen Haoyu, a teacher at Beijing No.25 Middle School and a self–protection expert, gives young students advice on how to deal with danger.
    If you are robbed
    Keep calm. If you cannot cry for help or run away, give the robber your money. Try to remember what the robber looks like and tell the police.
    If you are in a traffic accident
    If you are hurt by a car, take down the car number; if it is a bicycle, try to contact your parents before you let the rider go. This is because you don't know how seriously you are hurt.
    If it is raining hard and there is lightning
    Don't stay in high places and keep away from trees.
    When there is a fire
    Get away as fast as you can. Put wet things on your body and try and find an exit. Do not take the lift!
    If someone is drowning(溺水)
    If you can't swim, don't get into the water. Cry out for help.
    Remember that danger is never as far away as you think. Take care of yourself at all times!