31. 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.
32. 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.
33. 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.
34. 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.
35. 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.
36. According to the passage， some engineers are trying to improve the handlebars because
A. they are not noble enough.
B. they may kill children.
C. they are likely to crash.
D. they make the bike move at a low speed.
37. In paragraph 2， the author mentions a study of serious abdominal injuries
A. to discuss how abdominal injuries in children occur.
B. to show that more than a third injuries were caused by bicycle accidents.
C. to point out what the countermeasures can be.
D. to tell us why Kristy Arbogast began the project.
38. Paragraph 3 mainly discusses
A. why the children and their parents were interviewed.
B. when the children tom the handlebars through 90 degrees.
C. what causes the children to topple over.
D. how serious injuries occur.
39. The passage implies that
A. it is not easy to persuade manufacturers to adopt the new design.
B. the team of engineers has not found any countermeasures.
C. children like to ride bicycles at a very low speed.
D. a lot of children were killed in bicycle accidents in the past 30 years.
40. The new handgrip works in which of the following ways?
A. It call be commercialized.
B. It reduces the dangerous forces in bicycle accidents.
C. It adds a few dollars to the cost of a bike.
D. It changes the direction of the handlebars in all impact.
41. In paragraph one， what does "the school of tomorrow" mean?
A. The school with a central building.
B. The school with four or five master studios.
C. The school with television.
D. The school with televised lessons and electronic teaching tools.
42. After a televised lesson， which will not happen?
A. The classroom teacher will take over for the all important "follow-up" period.
B. The lessons will be carried into classrooms all over a city， or even an entire country.
C. The students will ask any troublesome questions.
D. Difficult points will be cleared up through discussion.
43. In the following statements， which one will not happen in the televised lesson?
A. The teacher will still have to play an important role.
B. The chalk and erasers will still be used.
C. Each student will receive an individual lesson.
D. The lessons will be specifically geared to the students' levels of ability.
44. What kind of lessons will the students have?
A. The same lessons.
B. Individual lessons according to their ability levels.
C. Individual lessons according to the teacher's instruction.
D. Individual lessons according to their parents' instruction.
45. According to the last paragraph， which one is true?
A. Homework will be handed in via electronic mail system.
B. Homework will be not be assigned.
C. Students never take examinations.
D. Students get the score after a long time.
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