Apples are a type of widely-cultivated fruit that grows on【21】. Apple trees grow in cold and temperate areas【22】the world. There

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问题     Apples are a type of widely-cultivated fruit that grows on【21】. Apple trees grow in cold and temperate areas【22】the world. There are thousands of different varieties of apples,【23】Jonathan, Mcintosh, Granny Smith,【24】Red Delicious.
    An apple tree can grow to over 35 feet【25】. Each spring, an apple tree【26】pink and white flowers.【27】a blossom has been fertilized,【28】develops.【29】each apple are small, brown seeds, which can grow into【30】apple trees. Each fall, apple trees【31】their leaves — they are deciduous.
    Early in US history, John Chapman (nicknamed Johnny Appleseed)【32】apple seeds around 【33】of the USA.
    Apples are a【34】snack; there is【35】saying, "An apple a day keeps the doctor away."

选项 A、When
B、Then
C、Before
D、After

答案D

解析 前文说了苹果树开出白色或粉色的花,然后经过施肥,苹果开始成长。after指……之后,then指“然后”,when指前后两个动作同时,before指……之前。
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