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【单选题】位于美国亚利桑那州西北部的科罗拉多大峡谷，全长446千米，平均宽度16千米，最深处2133米。峡谷两侧都是红色的含有代表性的生物化石的巨岩断层，这里的土壤大都是褐色，但当它沐浴在阳光中时，由于不同岩层中的矿物不同，色彩时而深蓝，时而又是赤色，变幻无穷，令人流连忘返。【图片】下列关于峡谷地貌的形成过程，正确的是
A.
固结成岩—风化剥蚀—侵蚀搬运
B.
高压变质—地壳抬升—风化剥蚀
C.
岩浆侵入—地壳抬升—侵蚀搬运
D.
外力沉积—地壳抬升—流水侵蚀
【单选题】用于耐火防护的材料产品，应按等效工程使用条件的燃烧试验满足耐火极限不低于 1h的要求，且耐火温度不低于( )。
A.
100℃
B.
500℃
C.
1000℃
D.
2000℃
【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