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Animals should   because many of them are in danger.(  )

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in danger  in public  in silence    in trouble  
up    for    against    down  
though  because  if  because of  
thousand of  thousands of  two thousands of  two thousand of  
Because    As    With    Since  
Because  As  With  Since  
though  because  if  because of  
viruses are known to cause cancer in animals  at present, human cancer is not believed to be contagious(传染的)  there are many known causes for the transformation of a normal cell to a cancer cell  results of experiments on plants and animals do not vary greatly from species to species  
up    for    against    down  
though  because  if  because of  

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