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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】下列属于钢轨轨端或轨顶面剥落掉块轻伤标准的是（）。
A.
轨端或轨顶面剥落掉块长度超过30mm且深度超过4mm
B.
轨端或轨顶面剥落掉块长度超过30mm且深度超过8 mm
C.
轨端或轨顶面剥落掉块长度超过15mm且深度超过8 mm
D.
轨端或轨顶面剥落掉块长度超过15mm且深度超过4 mm
【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