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【单选题】
松属植物的叶常为针形，通常2，3或5针一束，基部为叶鞘所包围，白皮松的针叶属于（）
A.
2 针一束
B.
3 针一束
C.
5 针一束
D.
2-3 针一束
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参考解析：
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【单选题】Many national parks in the west areas of America are among the United States, most treasured natural spaces．From Yellowstone to Yosemite, US national parks stand as monuments to Americans, love of nat...
A.
Americans' cherish their legendary Wild West
B.
the recognition of the importance of these parks
C.
Americans' love of nature and spiritual connection to the land
D.
the appreciation of the beauty and recreation of these places