Which of the following is closest in meaning to the rifle？
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.
查看答案
Which of the following statements is meant by the writer？
A. Ehleringer was successful in his research.
B. Ehieringer failed in his research.
C. Ehleringer can be a successful detective.
D. Ehleringer's research proved successful in China.
What does the experiment mentioned in paragraph 4 prove？
A. There are more enzymes in decal drinkers' urine sample.
B. There are more melatonin concentrations in caffeine drinkers' urine sample.
C. Decaf drinkers produce less melatonin.
D. Caffeine drinkers produce less sleep hormone.
lames 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 co0aposition of hair can indicate exactly where people are from.
The National Science Foundation involves itself directly in writing up material about ethical issues.
A. Right
B. Wrong
C. Not mentioned
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