The total quantity of water on Earth

试卷相关题目

• 1Liquid water only exists

  A.in the center of the earth.

  B.on the surface of our planet.

  C.in a very narrow range of temperatures.

  D.in the coastal areas of the earth.

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• 2The half-life of C-14 is about 25，000 years.

  A.Right

  B.Wrong

  C.Not mentioned

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• 3The C-14 in an organism begins to decay when it dies

  A.Right

  B.Wrong

  C.Not mentioned

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• 4Radiocarbon is reliable in dating an object back to at least 50，000 years.

  A.Right

  B.Wrong

  C.Not mentioned

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• 5Radar is used to determine the characteristics of radiocarbon

  A.Right

  B.Wrong

  C.Not mentioned

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• 6Most of the fresh water on Earth

  A.is stored underground.

  B.is in the form of ice at the Poles and on mountains.

  C.is found in rivers and lakes.

  D.comes from the rain.

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• 7The word “fraction” in the second paragraph means

  A.a very small amount.

  B.a large area.

  C.an important system.

  D.a major source of information

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• 8There is more of rainfall

  A.over the mountains than over the rivers.

  B.over the rivers than over the mountains

  C.over the oceans than over the lan

  D.D.over the land than over the oceans.

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• 9What is responsible for processing the information sent by your eyes？

  A.The magnetic system in the brain.

  B.The central part of the heart.

  C.Oxygen-rich bloo

  D.D.Neurons in the brain.

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• 10The function of an fMRI machine is

  A.to show how neutrons take in oxygen-rich blood.

  B.to measure how dense the blood is in the brain.

  C.to record how much oxygen the brain consumes.

  D.to identify which parts of the brain are processing information

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