Bananas are plants that grow in tropical regions. They grow four to thirty feet in height. The banana looks like a tree, 【C1】___

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问题     Bananas are plants that grow in tropical regions. They grow four to thirty feet in height. The banana looks like a tree, 【C1】______is not a tree. It does not have a woody stem. 【C2】______, its leaves grow from a tough rootstock by which the plant spreads.
    One large【C3】______grows from the central stem of the plant. This flower【C4】______into the fruit. Each plant has a number of bananas growing together, 【C5】______can weigh as much as forty-five kilograms. Cultivation of the banana has resulted in a fruit that has no seeds. 【C6】______Plants are started from the old plant.
    Bananas are【C7】______while they ate green. They ate then loaded on trains to be transported to ships that carry them to many parts of the world. During shipment, they begin to【C8】______and turn yellow. Brazil is the leading banana-growing country, producing as much as five million tons a year. The United States imports more bananas than【C9】______other country.
    Bananas are a source of some important nutrients, including vitamins and sugar. They have great【C10】______in the treatment of certain diseases. Some banana plants can also be used to make rope and certain cloth.
【C5】

选项 A、what
B、that
C、which
D、they

答案C

解析
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