But how long does it take these bacteria to attach to food? To answer that question,a team of scientists at Clemson University in South Carolina decided to test the 5-second rule,using sandwich ingredients.First,they placed a known amount of Salmonella cells on three surfaces:wood,tile,and carpet.They placed a slice
of bread and a slice of bologna on each surface for 5,30,or 60 seconds.After just 5 seconds,both the bread and bologna picked up enough bacteria to make you sick.
So,forget the 5-second rule.If your toast lands on the floor,toss it out.
5.What is“a 5-second rule”?
A.If you drop food on the ground,you can’t eat it unless you pick it up within five seconds.
B.If you drop food on the ground,you can’t eat it unless you pick it up five seconds later.
C.If you drop food on the ground,you can eat it even you pick it up five seconds later.
D.If you drop food on the ground,you can eat it at any time after you pick it up.
6.According to the text,which of the following statements about bacteria is NOT correct?
A.They can cause many kinds of illnesses.
B.They are single-celled organisms.
C.They can grow on the surface of food.
D.They only can be found on food.
7.How can people avoid the infection of Salmonella?
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