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【单选题】
红松、华山松、白皮松均具有此特点：______。
A.
叶鞘宿存
B.
鳞叶不下延
C.
叶内有2条维管束
D.
针叶五针一束
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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