正确答案: B

青冈属

题目：的壳斗上苞片结合成同心环。

解析：B

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举一反三的答案和解析：

[单选题]We laugh at jokes，but seldom about how they work．

do we think

[单选题]------Poor Steve! I could hardly recognize him just now!------_______________, He has changed so much.

Me neither

[单选题]Edward, you play so well. But I _________ you played the piano.

didn't know