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发表于 2016-7-12 06:59:27
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分页标题#e#
M: I found plankton were too small to be seen。
W: That's a common misconception. The term plankton covers a wild variety of freely flowing plants and animals, from microscopic one cell organisms to larger ones, such as the common jellyfish。
M: Jellyfish may be large enough to be seen. But they are transparent, aren't they?
W: Yes, most planktons have transparent tissues as protected camouflage, it makes them practically invisible to predators。
M: But not invisible to your biology class, I hope。
W: By concentrating, I was able to see the outlines of lots of different plankton plants and animals. In fact, our professor even took photographs of gastropods, which are small oceanic snails。
M: How would the snails show up in the photographs of their transparence?
W: We scoured it with harmless green dye since particles of the dyes stuck to their tissues, the snails appeared in green outline in the photographs。
M: That sounds like an interesting trip. But I think if I'd been in Florida in February, I'd much rather spend my time just swimming and lying in the sun。
Questions 23 to 25 are based on the conversation you have just heard。
23. Why was the woman in Florida?
24. Where did the woman spend most of her time while she was in Florida?
25. What is NOT true about plankton according to the woman?
Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A)， B)， C) and D). Then mark the corresponding letter on Answer Sheet 2 with a single line through the center。
Passage One
An unusual form of legal system prevailed in Eskimo societies in the harsh Arctic regions. Eskimo societies were organized into local groups that lacked any real form of government, although they had a headman who led the group. The headman had no legal or judicial authority, and there were very few laws in these cultures. The Eskimos also recognized few crimes against property because people did not own land. The custom of freely borrowing goods from each other also discouraged stealing。
In the past, certain Eskimo cultures permitted some forms of homicide, including the killing of sickly infants, senile or sickly elderly persons, and invalids. These actions were approved so that the society's resources could be used to support the healthy. Access to modern transportation and medicine has greatly changed this situation。
In the Eskimos' cultures, wife stealing was not a crime, and it was usually committed by a man who sought to outrank socially the man whose wife was stolen. Legal disputes, such as wife stealing, were settled by the murder of the offender (and the risk of a possible feud with the offender's relatives) or by a song contest during which each party insulted the other. The winner is determined by whoever received the most applause。
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