86. What is the main idea of this passage?

1. An outbreak of O157: H7.
2. Food contamination on a rise.
3. A case report on food poisoning.
4. The flaws in the system of beef inspection.

87. We can learn from the passage that ____.

1. most people get sickened every year for eating hamburgers tainted by E. coli
2. so far there have been outbreaks of E. coli contamination of beef
3. beef contamination is so serious that it can be found in 41 states
4. Ms. Smith's reaction to O157: H7 is uncommon

88. The reason behind the way ground beef produced is ____.

1. the making of more profits
2. the satisfaction of the customers' needs
3. the vulnerability to E. coli contamination
4. the requirement of the federal government

89. We can infer that many big slaughterhouses ____.

1. conducted a recall if ground beef this summer
2. cannot be too careful about the safety of their beef products
3. actually know the possibility of their ground beef contamination
4. are completely ignorant of E. coli contamination of their beef supplies

90. As Bender implies at the end of the passage, ____.

1. it is wise for consumers to stay away from beef products
2. the outbreaks of E. coli contamination are on the decline
3. things are not completely satisfying
4. it is unhealthy to live on hamburgers

(Reference keys.)