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One Good Reason to Let Smallpox LiveIt’s now a fair bet that we will never see the total extinction of the smallpox virus. The idea was to cap the glorious achievement of 1980, when smallpox was eradicated in the wild, by destroying the killer virus in the last two labs that are supposed to have it-one in the US and one in Russia. If smallpox had truly gone from the planet, what point was there in keeping these reserves(51) reality, of course, it was naive to (52) that everyone would let (53) of such a potent potential weapon. 1 Undoubtedly several nations still have (54) vials. (55) the last "official" stocks of live virus bred mistrust of the US and Russia, (56) no obvious gain.Now American researchers have (57) an animal model of the human disease, opening the (58) for tests on new treatments and vaccines. So one again there’s a good reason to (59) the virus-just in (60) the disease puts in a reappearance.How do we (61) with the mistrust of the US and Russia (62) Keep the virus (63) international auspices in a well-guarded UN laboratory that’s open to all countries. The US will object, of course, just as it rejects a multilateral approach to just about everything. But it doesn’t (64) the idea is wrong. If the virus (65) useful, the let’s make it the servant of all humanity—not just a part of it. 57（）
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The World’s Longest Bridge Rumor has it that a legendary (传说的) six-headed monster lurks in the deep waters of the Tyrrhenian Sea between Italy and the island of Sicily. (46) When completed in 2010, the world’s longest bridge will weigh nearly 300,000 tons, equivalent to the iceberg that sank the Titanic, and stretch 5 kilometers long. "That’s nearly 50 percent longer than any other bridge ever built, "says structural engineer Shane Rixon. (47) They’ re suspension bridges, massive structures built to span vast water channels or gorges (峡谷). A suspension bridge needs just two towers to shoulder the structure’s mammoth (巨大的) weight, thanks to hefty (高强度的) supporting cables slung between the towers and anchored firmly in deep pools of cement at each end of the bridge. The Messina Strait Bridge will have two 54,100-ton towers, which will support most of the bridge’s load. The beefy (结实的) cables of the bridge, each 1.2 meter in diameter, will hold up the longest and widest bridge deck ever built. When construction begins on the Messina Strait Bridge in 2005, the first job will be to erect two 370-meter tall steel towers. (48) Getting these cables up will be something. It’ s not just their length--totally 5.3 kilometers--but their weight. (49) After lowering vertical "suspender" cables from the main cables, builders will erect a 60 meter-wide 54,630-ton steel roadway, or deck, wide enough to accommodate 12 lanes of traffic. The deck’s weight will pull down on the cables with a force of 70,500 tons. In return, the cables yank (拽) up against their firmly rooted anchors with a force of 139,000 tons equivalent to the weight of about 100,000 cars. Those anchors are essential. (50) A. Some environmentalists are against the project on biological grounds. B. What do the world’s longest bridges have in common C. If true, one day you might spy the beast while zipping (呼啸而过) across the Messina Strait Bridge. D. They’re what will keep the bridge from going anywhere. E. The second job will be to pull two sets of steel cables across the strait, each set being a bundle of 44,352 individual steel wires. F. They will tip up the scales at 166,500 tons--more than half the bridge’s total mass.
在一个理性的无摩擦的均衡市场上，期货价格与现货价格具有稳定的关系，即期货价格相当于交易者持有现货金融工具至到期日所必须支付的净成本。( )
If you break the law, you will not escape ______ (punish).
One Good Reason to Let Smallpox LiveIt’s now a fair bet that we will never see the total extinction of the smallpox virus. The idea was to cap the glorious achievement of 1980, when smallpox was eradicated in the wild, by destroying the killer virus in the last two labs that are supposed to have it-one in the US and one in Russia. If smallpox had truly gone from the planet, what point was there in keeping these reserves(51) reality, of course, it was naive to (52) that everyone would let (53) of such a potent potential weapon. 1 Undoubtedly several nations still have (54) vials. (55) the last "official" stocks of live virus bred mistrust of the US and Russia, (56) no obvious gain.Now American researchers have (57) an animal model of the human disease, opening the (58) for tests on new treatments and vaccines. So one again there’s a good reason to (59) the virus-just in (60) the disease puts in a reappearance.How do we (61) with the mistrust of the US and Russia (62) Keep the virus (63) international auspices in a well-guarded UN laboratory that’s open to all countries. The US will object, of course, just as it rejects a multilateral approach to just about everything. But it doesn’t (64) the idea is wrong. If the virus (65) useful, the let’s make it the servant of all humanity—not just a part of it. 52（）
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