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Enzyme-linked immunosorbent assay

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解析：Enzyme-linked immunosorbent assay：即酶联免疫吸附试验，指利用抗原或抗体可非特异性吸附于聚苯乙烯等固相载体表面，使抗原或抗体反应在固相载体表面进行，通过酶标记抗体或抗原对酶底物的显色反应进行测定的一种免疫学检测法。

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下图是校园网某台主机使用浏览器访问某个网站，在地址栏键入其URL时用sniffer捕获的数据包。请根据图中信息回答下列问题。

(1) 该URL的是 (1) 。

(2) 该主机的IP地址是 (2) 。

(3) 图中的①②③删除了部分信息，其中①是 (3) ，②是 (4) ，③是 (5) 。

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问答题

Ever since the economist David Ricardo offered the basic theory in 1817, economic scripture has taught that open trade—free of tariffs, quotas, subsidies or other government distortions—improves the well-being of both parties. U.S. policy has implemented this doctrine with a vengeance. Why is free trade said to be universally beneficial The answer is a doctrine called "comparative advantage". Here’s a simple analogy. If a surgeon is highly skilled both at doing operations and per forming routine blood tests, it’s more efficient for the surgeon to concentrate on the surgery and pay a less efficient technician to do the tests, since that allows the surgeon to make the most efficient use of her own time. By extension, even if the United States is efficient both at inventing advanced biotechnologies and at the routine manufacture of medicines, it makes sense for the United States to let the production work migrate to countries that can make the stuff more cheaply. Americans get the benefit of the cheaper products and get to spend their resources on even more valuable pursuits. That, anyway, has always been the premise. But here Samuelson dissents. What if the lower wage country also captures the advanced industryIf enough higher-paying jobs are lost by American workers to outsourcing, he calculates, then the gain from the cheaper prices may not compensate for the loss in U.S. purchasing power. "Free trade is not always a win-win situation," Samuelson concludes. It is particularly a problem, he says, in a world where large countries with far lower wages, like India and China, are increasingly able to make almost any product or offer almost any service performed in the United States. If America trades freely with them, then the powerful drag of their far lower wages will begin dragging down U.S. average wages. The U.S. economy may still grow, he calculates, but at a lower rate than it otherwise would have.
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