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【单选题】由于人们从( )谷壁可以观察到从古生代至新生代的各个时期的地层,因而被誉为一部“活的地质教科书”。
A.
Awaawapuhi峡谷
B.
佩特罗斯大峡谷
C.
东非大裂谷
D.
科罗拉多大峡谷
【单选题】Passage Two New ice core samples taken from the centre of the Greenland ice-sheet have given a detailed record of the last "interglacial(间冰期)" which ran from about 135,000 to 115,000 yea...
A.
there is an unseen hand controlling the earth’s movement
B.
there is an operating manual warning people against air-conditioning in the factory
C.
people should prepare operating manuals to tell workers how to get greater comfort
D.
people have been enjoying the most comfortable climate in Earth’s history