| A mother dolphin (海豚) chats with her
baby over the telephone! They were in separate tanks connected by a special
underwater audio link. "It seemed clear that they knew who they were talking
with," says Don White, whose Project Delphis ran the experiment. But what were
they saying Scientists think dolphins "talk" about everything from basic facts like their age to their emotional state. "I speculate that they say things like ’there are some good fish over here,’ or ’watch out for that shark because he’s hunting,’" says Denis Herzing, who studies dolphins in the Bahamas. Deciphering (译解) "dolphin speak" is also tricky because their language is so dependent on what they’re doing, whether they’re playing, fighting, or going after tasty fish. During fights, for example, dolphins clap (碰撞) their jaws to say "Back off!" But their jaws clap while playing, to A. Two connected tanks were separated for the talk. B. A clear voice could be heard in the two separate tanks. C. Both the mother dolphin and the baby knew each other. D. A special underwater audio link was set up for the talk. [单项选择]Many people -- especially the baby-boomers born between 1946 and 1964, who will be retiring over the next 20 years or so -- will be asking themselves whether they will have enough to keep them comfortable in their old age, even if they save a lot. After all, it is generally accepted that they cannot rely on the state. The burden on the taxpayer would be too great.
But, as already noted, financial wealth is just a claim on the assets produced by the economy. Making pensions a claim on the private sector rather than the public purse does not change the problem. Will businesses in 20 years’ time be producing enough income to pay the rewards and bond interest to pay baby-boomers their private-sector pensions And what will happen to asset prices if the boomers try to cash what they hold In demographic(人口统计学) terms, asset markets could be seen as a pyramid scheme, in which each generation aims to sell its accumulated savings to the next. Provided the next generation is larger A. the baby-boomers will upset the pattern B. there are more demographic problems in Japan C. the result concluded by John Llewellyn and Camille Chaix-Viros D. the emerging markets can be a way in approaching the problem [单项选择]You should carefully think over（） the manager said at the meeting.
A. that B. which C. what D. whose [单项选择]Should we care if over 150 known species of animals have (91) from the earth in the last fifty years Should we be concerned that there are (92) thousands of species whose very existence is (93) endangered—largely because of our activities (94) , after all, is the natural end of populations. Species are born, then (95) , and then die. Some live a (96) time, perhaps millions of years; some die more quickly. We have (97) the extinction of many species we know about, and we have undoubtedly sealed the (98) of others. In fact, there are undoubtedly many other species that have lived among us during our time on earth, but that have disappeared as a (n) (99) of our activities without our ever having known they existed.
It is hard to explain the rationale of many of us who are concerned about such matters. I have never seen a sea whale, (100) I don’t want them to become extinct A. upon B. to C. with D. from 我来回答: 提交
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