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【单选题】

防止货物震动的衬垫材料主要有_________。

A.
撑木
B.
厚木板、钢板等
C.
塑料布、席子、锯木粉等
D.
撑木、钢板、厚木板、锯木粉等均可
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【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