________ with a gas which is lighter than air, a balloon can float in the air.

试卷相关题目

• 1Teachers are not happy when they find in class their students sending ________ to their friends by mobile phone.

  A.letters

  B.messages

  C.notes

  D.informations

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• 2His new novel is ________ 20 chapters.

  A.consist of

  B.made up of

  C.made from

  D.made of

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• 3After we got seated in the bar, we were all _______ a drink.

  A.ready over

  B.ready for

  C.ready to

  D.ready

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• 4Would you please ________ me a Chinese-English dictionary from the next room?

  A.bring

  B.take

  C.carry

  D.fetch

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• 5He saw Naples ________.

  A.the first time

  B.for the first time

  C.first

  D.at first

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• 6Young children are beginning their _______ education at about six years old.

  A.informal

  B.new

  C.formal

  D.formally

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• 7The young girl has ________ many new designs in computer in recent years.

  A.thought of

  B.thought about

  C.thought up

  D.thought over

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• 8The road is blocked．The passengers are ________.

  A.dangerous

  B.in danger

  C.in the danger

  D.at danger

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• 9A strong wind is blowing from the sea toward the ________.

  A.earth

  B.land

  C.ground

  D.soil

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• 10You must _______ that the lights are turned off before leaving.

  A.know

  B.examine

  C.check

  D.remember

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