Up to now, no one has come up with a（n）_______ explanation of why dinosaurs died out, and it remains a mystery．

试卷相关题目

• 1 ________ early for his date, Mark spent time reading the newspaper.

  A.Arriving

  B.Having arrived

  C.Arrived

  D.To arrive

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• 2Because of H7N9 bird flu, all the chicken markets in Shanghai have been closed and won't open until further ________.

  A.sign

  B.symbol

  C.contact

  D.notice

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• 3 The crowd cheered wildly at the sight of Liu Xiang, who was reported ________ the world record in the 110meter hurdle  race.

  A.breaking

  B.having broken

  C.to have broken

  D.to break

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• 4 Finding information in today's world is easy. The ________ is how you can tell if the information you get is useful or not.

  A.knowledge

  B.ability

  C.competition

  D.challenge

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• 5 George returned after the war, only ________ that his wife had left him.

  A.to be told

  B.telling

  C.being told

  D.told

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• 6The teacher’s encouragement doesn’t ______ mean your progress, so you should try your best as well.

  A.necessarily

  B.directly

  C.formally

  D.hopefully

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• 7— The scarf is nice, but the price is a little bit high. — _______, but if you want good quality, you have to pay more.

  A.No wonder

  B.No doubt

  C.No offence

  D.No problem

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• 8— I'd like Johnson to take the job. — He is _______. Better not add to his workload.

  A.out of place

  B.outof order

  C.out of shape

  D.out of question

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• 9Those who suffer from the headache will find they get ________ from this medicine.

  A.safety

  B.relief

  C.defense

  D.shelter

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• 10There is no doubt_______ English is the widely used language all over the world.

  A.that

  B.whether

  C.if

  D.how

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