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【单选题】国家环保局对古树名木的分级标准为，距地面1.2m处的胸径在60cm以上的柏树类、白皮松、七叶树，胸径在70cm以上的油松，胸径在100cm以上的银杏、国槐、楸树、榆树等，且树龄在300年以上的，定为（）。
A.
特级古树
B.
一级古树
C.
二级古树
D.
三级古树
【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