James R. Ehleringer tried to find out ______.
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1 .By “more challenging (Para. 6)”, the author means _________.
A more interesting B more demanding C more attractive D more dangerous
2 .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.
3 .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.
4 .Which of the followings is NOT MENTIONED 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...
5 .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 t cook food.
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 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.
8 .Harry Potter is mentioned in the passage, because scientists
A can now make an invisible cloak of the same kind as he uses B try to make an invisible cloak of the same kind as he uses C try to invent a device similar in idea to the invisible cloak he uses. D know that it is possible to make an invisible cloak of the same kind
9 .What is true of microwaves?
A Their wavelengths are shorter than those of visible light B Their wavelengths are longer than those of visible light. C They are different from visible light as they are a kind of radiant energy D They are visible to the human eye.
10 .What is NOT true of the invisibility device?
A It is made of a special material with unusual ability B Microwaves bounce off it when they strike it. C Microwaves pass through it when they strike it D It bends the microwaves all the way around until they reach the opposite side.
