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    1. 1.

      Trees can get light from       in the daytime

      1. A.
        CO2
      2. B.
        O2
      3. C.
        the sun
      4. D.
        the moon
    2. 2.

      Chlorophyll is in         .

      1. A.
        sunlight
      2. B.
        soil
      3. C.
        air
      4. D.
        leaves
    3. 3.

      We can get more O?2 by         .

      1. A.
        planting more trees
      2. B.
        cutting trees down
      3. C.
        making the water in soil(土壤) polluted
      4. D.
        making more CO2
    4. 4.

      CO2 from air and      can produce food  for trees with the help of chlorophyll and sunlight

      1. A.
        water in the sea
      2. B.
        water from soil
      3. C.
        water in the river
      4. D.
        O2 into air
    5. 5.

      The picture tells us         .

      1. A.
        how trees let O2 go into air in the sunlight
      2. B.
        how trees let CO2 go into air in the sunlight
      3. C.
        the sunlight isn't important to trees at all
      4. D.
        trees can take in O2 and let out CO2
    CDABA
    本文通过图片来介绍植物的光合作用
    1.通过①的描述可以看出答案为C
    2.通过③的描述可以看出答案为D
    3.通过第六个论述可以看出答案选A
    4.通过第四个论述可以看出答案为B
    5.纵观全文可以看出答案为A
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