练习:
1. What does the writer say about tap water? Which of the following is NOT correct?
A) Tap water reflects the concentrations of hydrogen and oxygen isotopes in different regions.
B) Tap water is a kind of soft drink in the United States.
C) Tap water contains unique proportions of isotopes of hydrogen and oxygen.
D) Tap water is used to cook food.
2. James R. Ehleringer tried to find out
A) if our bodies break water down into its parts.
B) if it is possible to collect hair samples across the country.
C) if tap water contains unique proportions of isotopes of hydrogen and oxygen.
D) if the composition of hair can indicate exactly where people are from.
3. Which of the following statements is meant by the writer?
A) Ehleringer was successful in his research.
B) Ehleringer failed in his research.
C) Ehleringer can be a successful detective.
D) Ehleringer's research proved successful in China.
4. What does the last paragraph tell you?
A) The new technique can tell precisely where a person lives.
B) Water supplied in different regions all come from the same source.
C) Types of water used in different regions provide useful information for the police.
D) Hair samples provide the most important clues to identify crimes.
5. Which of the following is closest in meaning to the title?
A) Human hair may help detectives to solve crimes.
B) Animal hair may help detectives to solve crimes.
C) Detectives watch hairy criminals closely.
D) Most detectives are hair specialists.
