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设随机变量的数学期望,方差,用切比雪夫不等式估计得,则 10 （）

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The author mentions the 'stump speech' in paragraph 2 as an example ofA.an event created by politicians to attract media attention.B.an interactive discussion between two politicians.C.a kind of political presentation types of the nineteenth century.D.a stylE.of speech common to televised political events.

A.an
B.
B.an
C.
C.a
D.
D.a

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According to Sam's opinion, which word best describes the trend of older consumers?D.Zigzag.

A.Fall.
B.RisE.
C.V-shapE.

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