Which of the following statements is meant by the writer?
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1 .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
2 .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
3 .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...
4 .Which of the followings 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 t cook food.
5 .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
7 .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.
8 .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.
9 .What does the new study mentioned in Paragraph 1 find?
A Hungry people see every word more clearly than ordinary people． B Hungry people are always thinking of food—related words． C Hungry people are more sensitive to food—related words than stomach—full people． D Hungry people do not have lower—level of thinking process．
