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Escherichia coli , when found in conjunction with urethritis , often indicate infection higher in the uro-genital tract .

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Secondly , many elderly people are proud of being able to look after themselves and would feel shame to be looked after by anyone else , even close family members.

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Conceivably , increasing pollution not only causes serious problems such as global warming but also could threaten to end human life on our planet .

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Identify the topic sentence among the following sentence groups .

A. Gradually , stars and fans get closer ; outstanding writers and their admirers get deeper communication ; distinguish business leaders and their followers get better understanding .
B. Weibo is powerful social media which involves thousands even millions of people together .
C. Weibo makes it much easier for people to have communication with a larger range of people .
D. Especially , it's an excellent way for the public to know about famous people and communicate with them.
E. Those famous people are too busy to have enough time to communicate with the public in reality , but Weibo opens a window for them to share their happiness and sorrows.
F. Therefore , it is Weibo that enables modern people to expand and strengthent their linkage with the world .

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Identify the topic sentence .(A) School children used to know the story of how Abraham Lincoln walked five miles to return a penny he'd overcharged a customer . (B) It's the kind of story we think of as myth. (C) But in the case of Lincoln , the story is true unlike the story of George Washington and the cherry tree . (D) Washington's first biographer invented the tale of little George saying to his father , "I cant tell a lie .(E) I did it with my ax ." (F) What is important in both stories , however , is that honesty was seen as an important part of the American character .

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