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【简答题】
Watch the TED lecture- Why Should You Talk to Strangers •Answer the questions : (1).Do you think whether greeting the strangers is meaningless? (2).How did the old man’s saying make the speaker feel? (3).Why are we uneasy around the strangers? unit 1Ted.mp4
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【单选题】设 A , B 是两个随机事件,且 0 0, P ( B | A ) = P ( B | A c ) ,则必有 ( ).
A.
P ( A | B ) = P ( A c | B );
B.
P ( A | B ) ≠ P ( A c | B );
C.
P ( AB ) = P ( A ) P ( B );
D.
P ( AB ) ≠ P ( A ) P ( B ).