A．Scientists didn't try to find out the cause of overweight.

　　B．There is a link between mice's overweight and human's.

　　C．Lita proved the link between bacteria and weight gain.

　　D．Scientists found bacteria may be related to many diseases.

　　解析：细节理解题。根据第九段“The list of diseases that they may play a role in is just growing and growingD。4．The patient finally lost 51.4 kg of his weight after ________.

　　A．35 percent of his gut bacteria were killed

　　B．the amount of gut bacteria was decreased

　　C．he had a special kind of operation

　　D．his fatty liver had disappeared

　　细节理解题。根据第十一段内容可知研究者让病人吃一种特殊的食物以减少肠道里的细菌故选B。5．What does the passage mainly talk about?

　　A．People's eating habits.

　　B．Healthy lifestyles.

　　C．A medical discovery.

　　D．The consequence of obesity.主旨大意题。根据全文的内容来看这是关于人们肥胖的一个新的发现故选C。A man bought a donkey at the market one day and took him home.

　　The man had already owned several donkeys and he knew each one's character very well.One of the donkeys was very strong and brave.6.________

　　was eager to please but quickly exhausted.

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