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A：极限事故
B：稀有事故
C：严重事故工况
D：假想事故

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【英译中】Dolphins, like whales, must surface to breathe air through a blowhole on top of their heads. Dolphins are social animals and love company. Many of them, in fact, even enjoy being around humans. It is not uncommon to hear of dolphins giving rides through the water to humans.
In addition to being playful, dolphins are helpful to men. For example, as 400 B. C. the Greek poet Arion was saved from drowning by a dolphin. From then until now, dolphins have been helping swimmers who are in trouble. Swimmers, however, are not the only humans they help. In some parts of the world, they can be counted on to help men catch fish.
Moreover, dolphins are very intelligent. A dolphin's brain resembles a human brain, but it is larger. Consequently, some people claim that dolphins are really smarter than men. Of course, there is no way of proving this point. Brain size is not an absolute measure of intelligence. Furthermore, measuring dolphins' intelligence in other ways is not possible since men cannot fully communicate with them. Apparently, however, dolphins communicate with each other. At any rate, they make whistling, clicking and buzzing sounds which seem to be at least a form. of language. So far, however, men have not been able to figure out the communication code the dolphins use.

【中译英】每年春季，数以万计的中外客商云集申城，参加一年一度的华东出口品交易会。上海各类商品在这里与全国各地一比短长。上海的优势在于科技实力，因此高技术产口的出口应成为上海外贸出口增长的"排头兵"。著名物理学家杨振宁教授曾说："高科技战场是中国超越发达国家的主战场，也是最后的战场。"走发展高科技贸易之路，是历史的必然，也是末来的需要。

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