“有一只熊掉到一个陷阱里，陷阱深19.617米，下落时间正好2秒。求熊是什么颜色的？” 5个备选答案分别是“白色”、“棕色”、“黑色”、“黑棕色”、“灰色”。 我知道，听完之后已经亮瞎你的狗眼 ：“这是什么意思啊？”“掉进陷阱里，跟颜色有关吗？”我淡然一笑，你且听好！首先，根据题目算出g=9.8085，陷阱所在地的纬度大概是44度左右。根据熊的地理分布，南半球没有熊， 可以得知应该是北纬44度； 其次，既然为熊设计地面陷阱， 一定是陆栖熊，而且大部分陆栖熊视力不好，难以分辨陷阱，所以容易掉入陷阱； 至此，可选答案有：棕熊和美洲黑熊/亚洲黑熊，鉴于题目只有棕熊和黑熊，那么只剩下这两个答案。 既然陷阱深19.617米，土质一定为冲击母质，这样才易于挖掘。 棕熊虽然有地理分布，但多为高海拔地区，而且凶悍，捕杀的危险系数大，价值没有黑熊高，而且一般的熊掌、熊胆均取自黑熊。 又因为黑熊的地理分布与棕熊基本不重合，可以判定：该题的正确答案为掉进陷阱里的熊是黑色。

If you sign in with a day 4 experience, 18th 300000/4 = 75000 days, if start check-in at the age of 1, 100 = 100 days, you want to live almost 200 years to keep every sign in (who knows there is no sign in this thing after 200), water 4 experience again if you every day, half the time, but considering the reality, you can't live again in 100, in 50 years, you have to water every day 16 experience, may be you are a diligent person, water 32 experience every day, it need 25 years!!!!!!!!!!! Again if you are a big monster, daily water 64 experience, then as long as 12.5 years!!!!!!!!!!! If you are an impatient person, water 128 experience every day, you as long as 6.25 years!!!!!!!!!!!! If you are hungry, water 256 experience, every day that you fort, as long as 3.125 years!!!!!!!!!!! Of course, you will feel or too far away for 3 years, every day you are idle egg hurts, busy water 512 experience, bunkers, you only need to 1.5625 years, only a little more than a year and a half!!!!!