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【单选题】
若数列{a n }的前n项和S n =2n 2 -2n，则数列{a n }是（ ）A.
公差为4的等差数列
B.
公差为2的等差数列
C.
公比为4的等比数列
D.
公比为2的等比数列
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举一反三
【单选题】The writer feels long bus rides are like TV shows because
A.
the commercials both on TV shows and on billboards along the road are fun.
B.
they both have a beginning, a middle, and an end, with commercials in between.
C.
the drivers are always reckless on TV shows just as they are on buses.
D.
both traveling and watching TV are not exciting.
【单选题】Which of the following best describes how the writer feels about stage schools?
A.
He favours an early start in the training of performing arts.
B.
He feels uncomfortable about children putting on night shows.
C.
He thinks highly of what they have to offer.
D.
He doubts the standard of ordinary education they have reached.
【简答题】As regards putting an end to people's littering in the forest, the writer feels_________ . [A] confused [B] doubtful [C] worried [D] hopeful
【简答题】The writer feels long bus rides are like TV shows because
【单选题】假定5岁男童的体重服从正态分布,平均体重19.5kg,标准差2.3kg,则95%的医学参考值范围是
A.
19.5+1.96*2.3
B.
19.5+2.58*2.3
C.
19.5±1.96*2.3
D.
19.5±2.58*2.3
【简答题】___________ 被称为是科学管理之父
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