问题 解答题

某花农培育甲种花木2株,乙种花木3株,共需成本1700元;培育甲种花木3株,乙种花木1株,共需成本1500元。

(1)求甲、乙两种花木每株成本分别为多少元?

(2)据市场调研,1株甲种花木售价为760元,1株乙种花木售价为540元。该花农决定在成本不超过30000元的前提下培育甲乙两种花木,若培育乙种花木的株数是甲种花木的3倍还多10株,那么要使总利润不少于21600元,花农有哪几种具体的培育方案?

答案

解:(1)设甲、乙两种花木的成本价分别为x元和y元,

由题意得:

解得:

(2)设种植甲种花木为a株,则种植乙种花木为(3a+10)株,

则有:

解得:

由于a为整数,∴a可取18或19或20,

所以有三种具体方案:

①种植甲种花木18株,种植乙种花木3a+10=64株;

②种植甲种花木19株,种植乙种花木3a+10=67株;

③种植甲种花木20株,种植乙种花木3a+10=70株。

阅读理解

It all began with a stop at a red light.

Kevin Salwen was driving his 14-year-old daughter, Hannah, back from a sleepover in 2006 . While waiting at a traffic light, they saw a black Mercedes Coupe on one side and a homeless man begging for food on the other.

“Dad, if that man had a less nice car, that man there could have a meal.”Hannah protested. The light changed and they drove on, but Hannah was too young to be reasonable. She pestered (纠缠)her parents about inequity, insisting that she wanted to do something.

“What do you want to do?” her mom responded. “Sell our house?”

Warning! Never suggest a grand gesture to an idealistic teenager. Hannah seized upon the idea of selling the luxurious family home and donating half the proceeds to charity, while using the other half to buy a more modest replacement home.

Eventually, that’s what the family did. The project —crazy, impetuous (鲁莽的) and utterly inspiring — is written down in detail in a book by father and daughter scheduled to be published next month: “The Power of Half.” It’s a book that, frankly, I’d be nervous about leaving around where my own teenage kids might find it. An impressionable child reads this, and the next thing you know your whole family is out on the street.

At a time of enormous needs in Haiti and elsewhere, when so many Americans are trying to help Haitians by sending everything from text messages to shoes, the Salwens offer an example of a family that came together to make a difference — for themselves as much as the people they were trying to help. In a column a week ago, it described neurological evidence from brain scans that unselfishness lights up parts of the brain normally associated with more primary satisfaction. The Salwens’ experience confirms the selfish pleasures of selflessness.

Mr. Salwen and his wife, Joan, had always assumed that their kids would be better off in a bigger house. But after they downsized, there was much less space to retreat to, so the family members spent more time around each other. A smaller house unexpectedly turned out to be a more family-friendly house.

小题1:The best title for the passage should be “______”.

A.The Less, the Better

B.An Expected Satisfaction

C.Something We Can Live Without

D.Somewhat Crazy but Inspiring小题2:What does the underlined word “inequity” most probably mean in Paragraph 3?

A.Unfairness.

B.Satisfaction.

C.Personal attitude.

D.Reasonable statement.小题3: What does the underlined sentence “Never suggest a grand gesture to an idealistic teenager.” means? ______

A.Never give a quick answer to an idealistic teenager.

B.Unless a child is realistic, never give an answer immediately.

C.Give an answer if the child is reasonable.

D.Don’t respond to a child's demands firmly without consideration.小题4: What can we learn from the last paragraph?

A.The Salwens regretted selling their house.

B.The relationship between the family members of the Salwens is much closer.

C.Small houses can bring happiness.

D.The Salwens intend to buy another big house.小题5:Which of the following statements is TRUE according to the passage?

A.Mercedes Coupe is only an ordinary car which is quite cheap.

B.Unselfishness has nothing to do with people’s primary satisfaction.

C.Hannah asked her parents to do something charitable and they sold their house.

D.The writer’s children asked him to sell their house.

单项选择题