Vitamin D helps our bodies make a special chemical，and this special chemical，________，affects our brains，making us feel happy.

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• 1The doctor advised her to eat more bean products________meat which might be harmful to her heart.

  A.for lack of　

  B.by means of

  C.in place of　

  D.in favour of

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• 2The United Nations is trying to free the world________the threat of war.

  A.at　

  B.in

  C.by　

  D.from

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• 3Many chemical substances react________oxygen.

  A.on

  B.with

  C.against

  D.to

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• 4The home ________ the lion is Africa while the koala bear is native ________Australi

  A.A.of；of

  B.to；to

  C.of；to

  D.to；of

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• 5Changyu building, _____ a history of more than 700 years, is well-known for its magnificent appearance ＿＿＿ the quiet and natural surroundings.

  A.having; in

  B.with; against

  C.with; for

  D.has; against

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• 6Knowing what colors look good _______ your skin is of great importance when you buy clothes.

  A.beyond

  B.within

  C.against

  D.Over

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