答案　B　[由第一段可知选B。]

　　49．The film 2017 is________.

　　A．about the end of the world

　　B．based on the scientific prediction

　　C．well accepted in the science field

　　D．about a romantic love story

　　答案　A　[由第二段第一句可知，电影《2017》是关于世界末日的故事。]

　　50．We can infer that________.

　　A．people didn't take the rumor seriously

　　B．Planet X—or Nibiru does exist

　　C．astronomers have been tracking Planet X for over ten years

　　D．the rumor caused a panic among some people

　　答案　D　[由第一、二、三段可知，电影《2017》展现了世界末日来临前后的状况，美国航天局对此进行了反驳，目的在于澄清科学事实及消除人们的恐慌。故选D。]

　　51．NASA thinks that Eris________.

　　A．might pose a threat to the Earth

　　B．doesn't pose any threat to the Earth

　　C．is too far away to be visible

　　D．is similar to our planet，where life might exist

　　答案　B　[由第四段可知选B。]

　　E

　　There are many American expressions about insects—like bees，for example.Bees are known as very hard workers.They always appear to be busy，moving around their homes，or hives(蜂房)．So you might say you are as busy as a bee if you spend your weekend cleaning your house.In fact，you might say your house is a beehive of activity if your whole family is helping you clean.You also might say you make a beeline for something if you go there right away.When we go to see a movie，my friend always makes a beeline for the place where popcorn is sold.

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