四个数，每次选出三个数算出它们的平均数，用这种方法计算了四次，分别得到四个数：86，92，100，106．那么原来这四个数的平均数是（　　）

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    Where there is a will(意志), there is a way. The secret of s____  is not much money but a strong will. In other words, a man can't w____   without a strong will. It is quite clear that there is nothing d____ in the world. If a person makes up his mind to do it, he will certainly r____ his goal. A student should r____  the following duties: we s____ care about our parents; we have to study as h____  as possible, we must be honest and keep our words as well. E____  of us should receive good education. Our parents send us to school to let us get k____ and wish us to be a hard-working and successful person in the future. So when we fail, don't lose heart. Keep on working u____ we succeed. Make sure nothing could prevent you from trying.

已知⊙O与直线l相切于A点，点P、Q同时从A点出发，P沿着直线l向右、Q沿着圆周按逆时针以相同的速度运动，当Q运动到点A时，点P也停止运动．连接OQ、OP（如图），则阴影部分面积S₁、S₂的大小关系是（　　）

“植物人”有心跳、呼吸，不能自主活动、无意识，可确定神经系统未受到损伤的是（   ）