已知某商品的进价为每件40元，售价是每件60元，每星期可卖出300_爱下问搜题

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问题解答题

已知某商品的进价为每件40元，售价是每件60元，每星期可卖出300件．市场调查反映：如调整价格进行涨价销售，每涨价一元，每星期要少卖出10件．该商品应定价为多少元时，商场能获得最大利润？

答案

设商品定价为x元，商场每星期的利润为y元．

y=（x-40）[300-10×（x-60）]=（x-40）（-10x+900），

∴x=

40+90

2

=65元时，

商场利润最大为：25×250=6250元．

答：商品定价为65元时，商场利润最大为6250元．

完形填空

What’s a typical（典型的）day like in Buenos Aires（布宜诺斯艾利斯）? For Diego, who lives with his parents in a house in Buenos Aires, a school day starts    41 . If his mother doesn’t wake him up at 6:00 a.m., his dog Luna will. Diego    42   himself quickly and takes Luna for a walk.
Then it’s time to get ready for school. Diego puts on his school clothes and eats a quick    43 . He slings（抛）his heavy schoolbag over his shoulder and gets onto the city bus for the 25 minutes’ 44   to school.
Diego is in the seventh year of primary school. Classes start at 8:00 a.m. with math, followed
45  history and music. At 1:00 p.m., Diego and his friends have their lunch. After lunch, Diego heads to English class. This is one of his favorites,    46  the students practise English by writing e-mails to students in    47   countries.
When the    48   class ends, Diego and his friends    49  the bus to a city park to play football. Then he’s back home to start on homework. If he finishes in time, Diego will cook dinner. His parents come home from work at about 8:00 p.m., and    50   they sit down to dinner. After dinner, Diego does some reading or watches TV before getting ready for bed!

单项选择题

下列属于良性肿瘤的（）。

A.骨髓瘤

B.神经母细胞瘤

C.神经鞘瘤

D.白血病

E.无性细胞瘤