问题 解答题

某旅游商品经销店欲购进A、B两种纪念品,若用380元可购进A种纪念品7件、B种纪念品8件;也可以用380元购进A种纪念品10件、B种纪念品6件。求:

(1)A、B两种纪念品的进价分别为多少?

(2)若甲产品的售价是25元/件,乙产品的售价是37元/件, 该商店准备用不超过900元购进甲、乙两种产品共40件,且这两种产品全部售出总获利不低于216元,问:应该怎样进货,才能使总获利最大?最大利润是多少?

答案

解:(1)设A的进价是x元/件,B的进价是y元/件

                      ∴

    答:A的进价是20元/件,B的进价是30元/件;

(2)设购甲产品a件,则购进乙产品40-a件 

        

               ∴

       ∵a取正整数 ∴a=30、31、32

          设总获利是w元

        

         ∵-2<0     ∴w随a的增大而减小

         ∴当a=30时 

        此时进货方案:A产品进30个,B产品进10件.

 答:当A产品进30个,B产品进10件时,获利最大是220元。

阅读理解

“Choo, Choo!” Here comes the Chunnel train. Get aboard if you want to learn more about this underground transportation system. This is an unusual form of transportation, because it is a tunnel that trains travel through and not an actual form of transportation.

The Chunnel is actually the English nickname for the Channel Tunnel. In French, it is called le tunnel sous la Manche. It is a rail tunnel beneath the English Channel at the Straits of Dover. It connects Cheriton in Kent, England with Sangatte in northern France. It is the second longest rail tunnel in the world.

Did you know that the British and the French had a race whi1e they were building the Chunnel? The race was to see who could get to the middle of the tunnel first. The British won by a little bit. It took 15,000 workers over seven years to dig the tunnel. The tunnel was finished in 1994.

The completed Chunnel cost about $ 21 billion. But it all paid off, because it became very popular, very quick. Millions of people use it. Now it is getting even more popular.

There are three complete tunnels in the Chunnel. The two outside ones are the passenger trains. The small inner one is a guidance train. The guidance train is not used for transportation. Each track is exactly parallel to each other.

There are four different train systems in the Chunnel. The Eurostar is a high speed passenger service that connects London, Paris, Brussels, and Lille. The Eurotunnel shuttle is a rail ferry service. These shuttles carry cars. These are railcars that allow drivers to drive their vehicles on and off. There are also two Eurotunnel goods service trains.

Now you know more about the Chunnel. Everybody off, this is the last stop.

小题1:The Channel Tunnel links ______ with _______.

A.Dover; Kent

B.London; Paris

C.Lille; Brussels

D.Cheriton; Sangatte小题2:Which of the following shows the structure of the tunnels in the Chunnel?

小题3:The Eurotunnel shuttle is intended to carry _________.

A.passengers

B.drivers and their vehicles

C.goods

D.staff members of the Chunnel小题4:The text can most probably be __________.

A.found in a textbook

B.read in a magazine

C.broadcast on a train

D.heard in a railway station

单项选择题