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【单选题】
A plant makes its own food in its leaves. Water comes to the leaves through the roots. Air gets into the leaves through very small holes. The green coloring(叶绿素) in the leaves uses the water and air to make the food for the plant. It also needs sunshine because a plant can make food only when the sun is shining.
Animals and people could not live without green plants. They both eat plants. People and some animals also eat the meat of some animals and these animals eat plants. A plant gets food from ______.
A.
the sun
B.
its leaves
C.
its roots
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【单选题】Most growing plants contain much more water than all other materials combined. C.R. Dames has suggested that it is as proper to term the plant a water structure as to call a house composed mainly of b...
A.
to derive energy from light
B.
to preserve water
C.
to combine carbon dioxide with water
D.
to form sugars
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【单选题】Most growing plants contain much more water than all other materials combined. C.R. Dames has suggested that it is as proper to term the plant a water structure as to call a house composed mainly of b...
A.
to derive energy from light
B.
to preserve water
C.
to combine carbon dioxide with water
D.
to form sugars
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