Why didn't NASA scientists identify the problem before the orbiter left for Mars、

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• 1What caused the orbiter's problem、

  A.Scientists used wrong guidelines of mathematics.

  B.Scientists used wrong building materials.

  C.Scientists used different operating systems.

  D.Scientists used different measurement systems.

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• 2When did the orbiter's problem begin、

  A.Right after it left for Mars.

  B.When it got near Mars.

  C.Right after it landed on Mars.

  D.When it returned to Earth.

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• 3How long did it take the orbiter to get close to mars、

  A.One year.

  B.Less than one year.

  C.About two and a half year.

  D.More than three years.

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• 4NASA built the mars climate orbiter to get information about __________.

  A.possible life on Mars

  B.the size of Mars

  C.the shape of Mars

  D.the atmosphere of Mars

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• 5We can conclude from this passage that ballet _________.

  A.will continue to change

  B.is a dying art

  C.is currently performed only in Russia

  D.is often performed by dancers with little training

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• 6Whooping cranes migrate in winter to__________.

  A.find warmth and food

  B.raise baby whooping cranes

  C.get human help

  D.lay eggs

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• 7Whooping cranes are native to__________.

  A.Mexico

  B.South America

  C.North America

  D.the Persian Gulf

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• 8Operation Migration aims to__________.

  A.teach adult cranes how to fly

  B.lead young cranes on their first trip south

  C.breed cranes in special parks

  D.transport cranes to the North

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• 9The distance covered by the young whooping cranes on their trips south is__________.

  A.120 miles

  B.1,200 miles

  C.1,931 miles

  D.2, 000 miles

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• 10If Operation Migration is successful, whooping cranes will __________.

  A.follow airplanes south every year

  B.live in Canada all year round

  C.learn to migrate on their own

  D.be unable to fly back

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