★1.According to the passage，the concept of“opportunity cost”is applied to ________.

　　A．making more money

　　B．taking more opportunities

　　C．reducing missed opportunities

　　D．weighing the choice of opportunities

　　2.The“leftover...time”in Paragraph 3 probably refers to the time ________.

　　A．spared for watching the match at home

　　B．taken to have dinner with friends

　　C．spent on the way to and from the match

　　D．saved from not going to watch the match

　　3．What are forgone opportunities?

　　A．Opportunities you forget in decision­making.

　　B．Opportunities you give up for better ones.

　　C．Opportunities you miss accidentally.

　　D．Opportunities you make up for.

　　Passage 1　(2017·安徽)

　　话题：大象与蜜蜂

　　词数：334

　　Recordings of angry bees are enough to send big，tough African elephants running away，a new study says.Beehives (蜂窝)—either recorded or real—may even prevent elephants from damaging farmers' crops.

　　In 2002，scientist Lucy King and her team found that elephants avoid certain trees with bees living in them.Today，Lucy wants to see if African honeybees might discourage elephants from eating crops.But before she asked farmers to go to the trouble of setting up beehives on their farms，she needed to find out if the bees would scare elephants away.

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