答案　C　[细节理解题。根据文章第三段中Some of the other conclusions he drew are that nothing can go faster than ligth...可知光比任何其他物体的速度都要快。]

　　43．Einstein added that if something such as a ruler was moving it would seem to get shorter and shorter________.

　　A．because the ruler itself was short

　　B．when it was moving faster and faster

　　C．because we can't see it clearly

　　D．because the ruler was broken into pieces

　　答案　B　[细节理解题。根据文章第三段．..if something such as a ruler was moving faster and faster...near the speed of light.可知。]

　　C

　　Walking with long steps on purpose，Barack Obama appears to have arrived to visit an elementary school he attended as a boy.But wait.It's not real Obama.The US President is back in Washington，D.C.

　　So who is this guy？He's Ilham Anas,34，a teen­magazine photographer who has taken advantage of his striking resemblance to Obama and turned it into his own brand of celebrity and wealth.

　　Since his sister told him in 2007 that he looked like the then presidential candidate，Anas' face and big smile have been seen on Southeast Asian TV and the Internet，appearing in the advertisements of medicine and other products.

　　He has also shown up on his nation's television talk show.Anas' resemblance to the president has turned his life around 180 degrees.He's even written an autobiography，“Because of Obama”．

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