惨象，____；流言，____。我还有什么话可说呢？（鲁迅《记念刘和珍君》）

图中，L₁和L₂是两只完全相同的灯泡，开关S闭合后电压表V₁的示数为4V，电压表V₂和V₃的示数应分别为（   ）

M（ $\alpha ,\beta$ ）= $\frac{1}{2}$ ( $x_1+y_1-\left|x_1-y_1\right|$ )+（ $x_2+y_2-\left|x_2-y_2\right|$ ）+ +（ $x_n+y_n-\left|x_n-y_n\right|$ ）

(Ⅰ)当n=3时，若 $\alpha =\left(1,1,0\right)$ ， $\beta =$ （0,1,1），求M（ $\alpha ,\alpha$ ）和M（ $\alpha ,\beta$ ）的值；

(Ⅱ)当n=4时，设B是A的子集，且满足；对于B中的任意元素 $\alpha ,\beta$ ,当a，β相同时,M( $\alpha ,\beta$ )是奇数;当aβ不同时,M( $\alpha ,\beta$ )是偶数,求集合B中元素个数的最大值

(Ⅲ)给定不小于2的n，设B是A的子集，且满足；对于B中的任意两个不同的元素 $\alpha ,\beta$ ,M( $\alpha ,\beta$ )=0,写出一个集合B,使其元素个数最多,并说明理由.

    In 1945，6 planes and 17 men disappeared without a sign, all in one day. This was Flight 19. Flight 19's captain was Lieutenant Charles Taylor. Flight 19 was a usual flight. It took off at about 2:10 p.m. from Miami. The weather was very normal on that December 5th of 1945. A message was received at 4：00 p．m.that told about pilot Taylor not knowing the way to go because his compass(指南针) was running around and around.

    After that，it was never heard from again.While searching for it，a search plane was also lost.The search for the both continued until December 10th of that same year.None of the things from Flight 19's planes，or from the search plane，was ever found.It is one of the most infamous disappearances. Searching for Flight 19 lasted five days，and covered 380，000 square miles. Dr. Kripke suggests that the accident happened because of a vortex(涡流).

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