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________ turn green in spring.

[  ]
A.

Leaf

B.

Leafs

C.

Leave

D.

Leaves

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76  Potatoes turn green when __________(暴露) to light.
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78  The __________ (主题) of the book is a very interesting one.
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81  You’d better wear a hat, or you’ll get s___________
82  A small child has to learn to keep his b________ before it can walk far.
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    As bananas ripen, the green skin turns ye11ow gradually. Chemical changes occur in the f1esh of the fruit as well:starch(淀粉)changes to sugar;pectin(果胶)breaks down,losing its stiffness; and the f1esh softens.

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