55. What is the best title of the article？

　　A. Birds come back home for love

　　B. Birds leave home for hatred

　　C. Birds can’t stay together long

　　D. Birds are easy to forget

　　54. How do the birds arrange their date of return ____.

　　A. is already known

　　B. will soon be known

　　C. can be easily discovered

　　D. is still unknown

　　53. When black-tailed godwits come home at the same time, it is very important for people to _______.

　　A. give them enough food

　　B. protect them

　　C. kill them D. live with them

　　52. According to the article, black-tailed godwits _______ their mates.

　　A. don’t love

　　B often turn against

　　C. often forget

　　D. are faithful to

　　51. It seems that pairs of godwits fly south every winter _________.

　　A. to find love B. to find food

　　C. to breed D on holiday

　　50. What is the best title of this article？

　　A. Pills help forget terrible memories

　　B. Pills help forget the past

　　C. How to forget the past D. How terrible memories do harm to us

E
　　It’s great to go on vacation, but it’s also nice to come home. Migrating (迁徙) birds seem to feel the same way. Birds such as black-tailed godwits (黑尾塍鹬), a migrating bird that can be found in Europe, Asia, north Africa and north Australia, fly south every winter. Then, they return home to spend the summer months with their life long partner.

　　Now, scientists have found, pairs of godwits often return to their summer breeding (繁殖) grounds within three days of each other, even though they spend the entire winter apart. It’s as if they arranged the date that they would meet up again.

　　Researchers in England, put coloured leg bands on the birds. Then, they asked birdwatchers around Europe to report by email when and where they saw the birds during the winter.

　　The simplest way for birds to return at the same time would be to spend the winter together. After all, if they’re in different places, they can’t call each other on the phone and talk about when they’ll meet again.

　　But, the survey found that couples usually spent their winters in different countries up to 1,000 kilometres apart. One male, for example, spent the winter on the coast of Ireland while his mate was in France.

　　These findings are important for protecting the birds, scientists say. Black-tailed godwits live for up to 25 years. They spend their summers in Iceland, where they mate, but they spread all over other parts of Europe in winter. Once a pair mates, there’s a 90 per cent chance that they’ll return to mate with each other again the next year. So, protection of their wide web of holiday destinations (目的地) is very important.

　　How do the birds arrange their date of return? Unless scientists find their feathered cellphones, that question will remain a mystery.

　　49. Joseph LeDoux thinks that _______.

　　A. the terrible memories are really existence, we should respect and control them

　　B. the terrible memories are easy to forget, we needn’t worry about them

　　C. the terrible memories can do good to us, we shouldn’t forget them

　　D. if we forget terrible memories we will forget everything, so we can’t develop pills to reduce or erase them

　　48. What does the word “relieve” in the sentence “This could relieve a lot of that suffering”.

　　A. increase B. keep

　　C. reduce D. strengthen

　　47. No matter how people think about this pill, the scientists’ intention to develop this pill is _______.

　　A. terrible B. bad

　　C. doubtful D. worth praising