Harry Potter is mentioned in the passage, because scientists
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1 .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.
2 .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...
3 .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.
4 .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
5 .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.
7 .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.
8 .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.
9 .What does the word "coaster" mean in the passage?
A A disk or plate placed under a drinking glass to protect a table top. B A vessel engaged in coastal trade. C A roller coaster D A resident of a coastal area.
10 .Harry Potter's invisibility cloak doesn't have any real competition yet, because
A scientists have not found out how his cloak works B the cloaking device is a total failure C the cloaking device works only for microwaves. D the cloaking device works only for visible light.
