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Certain extremely harmful bacteria found only in sewage are different to detect directly. Testing for E Coli, an easily detected and less harmful type of bacteria, in ocean water would be a reliable way of determining whetheror or not these more harmful bacteria are present, since ocean water contains E Coli only if the water is contaminated with sewage that contains the harmful bacteria.
which of the following, if ture, most seriously weaken the arguement?
A There are many different strains of the E Coli bacteria, and only some of these strains are harmful.
B Some type of bacteria found in sewage are neither disease-causing nor diffcult to detect directly.
C Some of the types of bacteria found in sewage along with E Coli are not harmful to people unless the bacteria are ingested in large quantities.
D E Coli dies out much more quikly than some of the more harmful bacteria found in sewage and then no longer be easily detected.
E Some of the types of bacteria found in sewage along with E Coli reproduce at a slower rate than E Coli.
Most television viewers estimate how frequently a particular type of accident
or crime occurs by how extensively it is discussed on television news shows.
Television news shows report more on stories that include dramatic pictures such
as fires and motor vehicle accidents than they do on more common stories that
have little visual drama such as bookkeeping fraud.
If the statements above are true, it can be properly concluded that which of
the following is also true?
A The time that television news reporters spend researching news stories is directly related to the number of viewers who will be affected by events like those in the news stories.
B It is easier for crimes such as bookkeeping fraud to go unprosecuted than it is for crimes such as arson.
C The number of fires and motor vehicle accidents greatly increases after each television news show that includes dramatic pictures of a fire or motor vehicle accident.
D Viewers of television news shows tend to overestimate the number of fires and motor vehicle accidents that occur relative to the number of crimes of bookkeeping fraud.
E The usual selection of news stories for television news shows is determined by the number of news reporters available for assignment.