________ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.

试卷相关题目

• 1To live with a high ideal is a successful life. It is not what one does, ________ what one tries to do, that makes a man strong.

  A.nor

  B.but

  C.or

  D.and

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• 2I was wondering what to do with my car which won't start ________ a kind man offered to help.

  A.while

  B.and

  C.so

  D.when

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• 3Inside the White House, there is a room called the Oval Office. That's ________ President Obama works.

  A.why

  B.where

  C.what

  D.how

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• 4_______ didn't attend the lecture yesterday won't be given full marks.

  A.Any one

  B.Whoever

  C.Who

  D.The person

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• 5—I think George doesn't really care for TV plays. —Right, ________he still watches the program.

  A.and

  B.but

  C.or

  D.so

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• 6________ I saw the beautifuldecorated house, I really wondered how she could manage that all by herself.

  A.While

  B.When

  C.As long as

  D.Now that

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• 7________ H7N9 is a deadly virus, it is still safe to eat thoroughlycooked chicken.

  A.Until

  B.While

  C.If

  D.Since

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• 8 ________ well prepared you are，you still need a lot of luck in finding a suitable job．

  A.However

  B.Whatever

  C.No matter

  D.Although

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• 9________small，the company has about 1,000 buyers in over 30 countries.  

  A.As

  B.If

  C.Although

  D.Once

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• 10_______ there are many different types of food, some animals spend their lives eating only one type.

  A.Since

  B.Unless

  C.Once

  D.While

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