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閱讀短文,從方框中選擇恰當?shù)脑~并用其適當形式填空,使短文完整、通順.每詞限用一次,其中有兩個是多余的.
stop,food,because,repeat,might,job,rain,connect,color,need,they,come
Have you ever heard of chlorophyll (葉綠素)?The name comes from the Greek words that mean green and leaf (樹葉).It's a good name (1)
because
because
chlorophyll gives leaves their green color.
Chlorophyll also has another important (2)
job
job
.It helps plants make food from sunlight,water and air.But leaves must make chlorophyll first,and to do that,they (3)
need
need
light.
During the long days of summer,leaves make lots of chlorophyll,so they can make lots of (4)
food
food
.All that green chlorophyll keeps the leaves looking green.
When fall (5)
comes
comes
,days get shorter.That tells trees to get ready for winter.They begin to store (貯存) food,and they (6)
stop
stop
making chlorophyll.
Without new chlorophyll,leaves quickly lose their green color.Some leaves begin to look yellow or orange.In fact,the yellow and orange (7)
colors
colors
are always in the leaf.They just can't be seen until the green color fades (變淡) and no longer covers (8)
them
them
up.
The leaves on some kinds of trees also start to turn red and purple.Scientists are not sure why,but they think the red color (9)
might
might
protect the leaves from bright sunlight and help the tree store more food before winter comes.That's why you'll see fewer reds in years when fall is (10)
rainy
rainy
or cloudy.The leaves don't need as much protection.

【考點】人與社會
【答案】because;job;need;food;comes;stop;colors;them;might;rainy
【解答】
【點評】
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發(fā)布:2024/4/20 14:35:0組卷:233引用:1難度:0.3
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