单项选择题

对一总体均值进行估计，得到95%的置信区间为（38），则该总体均值的点估计为（）

A.24
B.48
C.31
D.无法确定

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How does the speaker deal with emails now?
A、He checks and responds to them frequently.
B、He accesses them only during his real work hours.
C、He no longer responds to the most trivial of them.
D、He opens his inbox only when it’s necessary.

多项选择题

走中国特色社会主义政治发展道路，必须坚持( )有机统一.

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