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高普考/三四等/高員級◆英文題庫下載題庫

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請回答第 42 題至第 45 題: Real quicksand, the kind that is almost impossible to extricate yourself from, is not just water and sand. A report in the current issue of Nature shows that salt and clay are also major ingredients. Their study began when Dr. Daniel Bonn, a professor of physics at the University of Amsterdam, was in Iran a few years ago and saw signs warning of quicksand. Naturally, the warning prompted him to collect samples and he sank in to his ankles. He quickly escaped, but even shallow quicksand can be hard to step out of. Back home, Dr. Bonn and his colleagues found out why. Sand grains in quicksand are usually loosely packed, with the clay acting as a fragile gel holding the grains together. Hit with sudden force from a hapless victim, the quicksand gel turns to liquid. Then salt causes clay particles to stick to one another instead of the sand grains, with the result that a victim ends up surrounded by densely packed sand. The force needed to pull out a person immersed in quicksand is about the same needed to lift a car, Dr. Bonn said. The trick for escaping is to slowly wiggle the feet and legs, allowing water to flow in. People float in quicksand so it is also impossible to sink all the way in, but quicksand usually forms at river estuaries, so a captive could drown at high tide.
【題組】45 In what tone does the author present himself?
(A)humorous
(B)objective
(C)sarcastic
(D)pessimistic


答案:登入後觀看
難度: 簡單
1F
William Manso 高一下 (2014/12/31)

A).幽默的

B).客觀的
C).諷刺的
D).悲觀的

請回答第 42 題至第 45 題: Real quicksand, the..-阿摩線上測驗