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设函数f(x)在[a，b]上等于sinx，在此区间外等于零，若f(x)可以作为某连续型随机变量的概率密度，则区间[a，b]应为（）

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A．speechesB．soundsC．wordsD．voices

A. speeches
B. sounds
C. words
D. voices

What conclusion can be drawn from the passage？

A. The organization for the Olympic Games must be improved.
B. Athletes should compete as individuals in the Olympic Games.
C. Sport should be played competitively rather than for the love of the game.
D. International contests are liable for misunderstanding between nations.

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The design of the sink is indicative of a kitchen designer's intelligence.

A. Right
B. Wrong
C. Not mentioned

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设A、B相互独立，且P(A)＞0，P(B)＞0，则下列等式成立的是（）

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