In the past few years, research has suggested that Vitamin D may increase the level of serotonin（血清素）, one of the key neurotransmitters influencing our mood, and ________it helps to relieve mood disorders.

试卷相关题目

• 1A forest is usually found ________ heavy rainfall is frequent.

  A.in which

  B.which

  C.where `

  D.that

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• 2She is just the girl, with _______ my brother came to visit me last month.

  A.whom

  B.her

  C.that

  D.who

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• 3Ted came for the weekend wearing only some shorts and a T-shirt, _______ is a stupid thing to do in such weather.

  A.this

  B.that

  C.what

  D.which

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• 4The news_______ the girl studying at the art college had a_______ for music and dance___________us.

  A.which; gift; was pleased

  B.that; gift; pleased

  C.which; gift; pleased with

  D.that; gift; was pleased with

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• 5Can you make sure ______ the gold medal?

  A.where Maria had put

  B.where had Maria put

  C.where has Maria put

  D.where Maria has put

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• 6_______he really means is ________he disagrees with us.

  A.What … that

  B.That … what

  C.Why … that

  D.If … what

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• 7These countries will join one another against terrorism,________ was agreed to at the international conference.

  A.as

  B.who

  C.that

  D.what

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