3.Goldman hired a group of people to push carts around his market in order to 　. 

　　A.attract people to buy things in his market

　　B.encourage people to use his shopping carts

　　C.make his market different from the others

　　D.keep the groceries from being stolen

　　答案:B

　　解析:细节理解题。根据第七段中的“persuade people to give them a try”可知,他雇一些人假装顾客在超市里面推购物车的目的是想鼓励人们使用他的购物车。

　　4.What can we infer from the last paragraph?

　　A.Goldman will become very famous because of his invention.

　　B.Goldman’s invention will be regarded as the greatest one in the world.

　　C.Supermarket business has benefited a lot from Goldman’s invention.

　　D.There will be nothing that can replace Goldman’s invention.

　　答案:C

　　解析:推理判断题。根据最后一段的内容可知,现今购物车是Goldman发明的购物车的五倍大,这可能是美国人今天的购物花费是购物车发明之前的五倍的一个原因。由此可推断出,超市的生意从Goldman的发明中受益匪浅。

　　B

　　When a bee stings(蜇) you,it doesn’t just ruin your fun.The insect puts venom(毒液) into your skin,causing pain and swelling.But a chemist in Denmark believes he’s come up with a simple device that will draw the venom back out of the wound,bringing victims relief.

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