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【单选题】
山东地下大峡谷位于山东省沂水县城西南八公里处的龙岗山下，全长六千一百米，现已开发三千一百米的游览景线。该洞形成于二十万年前，由()发育而成，是我国的特大型溶洞之一，是江北第一长洞，被誉为'中国地下河漂流第一洞'。
A.
喀斯特裂隙
B.
细沙沉积
C.
风力侵蚀
D.
风力侵蚀
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】The Grand Canyon Standing on the rim of the Grand Canyon(大峡谷), gazing across this giant wound in the Earth’’s surface, a visitor might assume that the canyon had been caused by some ancient convulsion...
A.
Astronomy
B.
Botany(植物学)
C.
Geology
D.
Chemistry
【单选题】The Grand Canyon Standing on the rim of the Grand Canyon(大峡谷), gazing across this giant wound in the Earth’’s surface, a visitor might assume that the canyon had been caused by some ancient convulsion...
A.
it was caused by some ancient convulsion
B.
its presence is an embarrassment to the state of Colorado
C.
it looks like an injury on the Earth’s surface
D.
it has caused many visitors to injure themselves