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【单选题】
阿姨，今年57岁，已从工作单位上退休，阿姨属于A.
中年人;
B.
老年人;
C.
年轻老年人;
D.
.老年前期
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举一反三
【简答题】若等差数列 的前 项和为 ，若 ，则 _________．
【简答题】若等差数列 满足 ， ，则公差 ______； ______．
【简答题】等差数列 中，若 , ，则 .
【简答题】二等差数列 中，若 ， ，则 的前9项和 ＝ 。
【简答题】若数列 为等差数列， ， ，则 .
【简答题】wholesale _____
【单选题】wholesale
A.
a company or a person that provides a particular type of product
B.
a person who tried to be more successful than you
C.
time when the seller repairs or replaces a product free of charge
D.
the selling of goods to the public,usually through shops
E.
the selling of goods to businesses,usually in large quantities
F.
help,advice or free repair that you get after you buy a product
【简答题】等差数列 前 项和 ，若 ，则 __________.
【简答题】已知{ }为等差数列，若 ， ,则 ________.
【单选题】Which of the following statements about the wholesale and agency models for selling books is not true?
A.
In the wholesale model, the retailer decides at what price to sell a book to the consumer.
B.
Amazon surprised traditional publishers by selling e-books for below their wholesale cost.
C.
Amazon supports the agency model.
D.
A result of the agency model was that Amazon's prices on e-books rose.
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