The second paragraph uses facts to develop the essential idea that ________.

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• 1The essential function of photosynthesis in terms of plant needs is ________.

  A.to form sugars

  B.to derive energy from light

  C.to preserve water

  D.to combine carbon dioxide with water

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• 2A growing plant needs water for all of the following except ________.

  A.forming sugars

  B.sustaining woody stems

  C.keeping green

  D.producing carbon dioxide

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• 3According to the passage, it is true that ________.

  A.in the late 19th century in the United States the dividing line between adolescence and adulthood no longer existed

  B.no one can marry without the permission of his parents until the age of twenty-one

  C.one is considered to have reached adulthood when he has a driver’s license

  D.one is not free from the restrictions of child labor laws until he can join the army

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• 4Starting from 22, ________.

  A.one will obtain more basic rights

  B.the older one becomes, the more basic rights he will have

  C.one won’t get more basic rights than when he is 21

  D.one will enjoy more rights granted by society

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• 5No one can expect to fully enjoy the adulthood privileges until he is ________.

  A.eleven years old

  B.sixteen years old

  C.twenty-one years old

  D.between twelve and twenty-one years old

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• 6According to the passage, which of the following statements is TRUE、

  A.The mineral elements will not be absorbed by the plant unless they are dissolved in its root.

  B.The woody stems contain more water than the leaves.

  C.Air existing around the leaf is found to be saturate

  D.D.Only part of the carbon dioxide in the plants is synthesized.

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• 7This passage is mainly about ________.

  A.the functions of carbon dioxide and water

  B.the role of water in a growing plant

  C.the process of simple sugar formation

  D.the synthesis of water with carbon dioxide

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