Which of the followings is NOT correct?
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1 .People did not begin to use unmanned vehicles in undersea exploration until recently because of _______.
A the communication problem B the ocean depths C the movement of waves D the problem of vacuum
2 .By “more challenging (Para. 6)”, the author means ___.
A more interesting B more demanding C more attractive D more dangerous
3 .Ocean exploration is not so expensive as space travel mainly because ______.
A it is not affected Earth’s gravity B most undersea vehicles operate at the end of long ropes C ROVs have been put to use D there is no need for submersibles to get away from Earth’s gravity
4 .The sonar devices must be placed ________.
A from time to time B after the undersea vehicle dives C at the time when the undersea vehicle is diving D before the undersea vehicle dives
5 .Which of the followings is NOT MENTIONE in the passage?
A New techniques are continually developed and new machines invented for undersea exploration. B If not well built, a submersible is most likely to get crushed in deep water. C A submersible, when manned, looks very much like a spaceship. D In certain respects, undersea exploration is often faced wi...
7 .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
8 .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.
9 .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 comes 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.
10 .Which of the following is closest in meaning to the main idea of the passage?
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.
