货物以外币计价成交的由海关按照何时适用的计征汇率折合为人民币计算完税价格：A．装载货

阅读材料，回答问题。

材料一 张骞出使西域后，西域的使者、商人把中国的丝和丝织品，从长安通过河西走廊、今新疆地区，运往西亚，再转运到欧洲，又把西域各国的奇珍异宝输入中国内地，成为沟通中西交通的陆上要道。 ——人教版《中国历史》七年级上册

材料二      

唐朝对外主要交通路线图

材料三  宋朝的海外贸易超过了前代，成为当时世界上从事海外贸易的重要国家。中国的商船最远到了阿拉伯半岛非洲东海岸。政府设立专门机构管理海外贸易。南宋的财政收入中海外贸易占重要地位。——人教版《中国历史》七年级下册

材料四  清初的40年，实行严厉的禁海政策，将沿海居民内迁数十里，不许擅自出海贸易。后又只开广州一处作为对外通商口岸，并关闭其它港口。  ——人教版《中国历史》七年级下册

（1）根据材料一说出沟通中西陆上通道的名称及其历史作用。

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（2）根据材料二图中信息举出唐朝与A、B两地交往的史实。

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（3）根据材料三并结合所学知识，说出宋朝管理海外贸易的机构名称。

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（4）根据材料四并结合所学知识，回答清朝初期在对外关系上实行了什么政策？

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（5）综合上述材料说出我国古代从汉、唐、宋到清在对外交往上的特点。

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在下面的项目网络图中（时间单位为天），如果活动A的实际开始时间是5月1日早8时，在不延误项目工期的情况下，活动B最晚应在（）前结束

A、5月5日早8时

B、5月6日早8时

C、5月7日早8时

D、5月8日早8时

画家们在鉴赏精美的画卷时．常常使用放大镜来观察．其实，放大镜是______镜．把它放在物体的______．适当调整放大镜与被观察部分的______．就可以看到______像．

Portable foam type fire extinguishers are most effective on（）.

A.mattress fires

B.oil fires

C.wood fires

D.All of the above

It is no longer just dirty blue-collar jobs in manufacturing that are being sucked offshore but also white-collar service jobs, which used to be considered safe from foreign competition. Telecoms charges have tumbled, allowing workers in far-flung locations to be connected cheaply to customers in the developed world. This has made it possible to offshore services that were once non-tradable. Morgan Stanley’s Mr. Roach has been drawing attention to the fact that the "global labour arbitrage" is moving rapidly to the better kinds of jobs. It is no longer just basic data processing and call centres that are being outsourced to low-wage countries, but also software programming, medical diagnostics, engineering design, law, accounting, finance and business consulting. These can now be delivered electronically from anywhere in the world, exposing skilled white-collar workers to greater competition.

The standard retort to such arguments is that outsourcing abroad is too small to matter much. So far fewer than lm American service-sector jobs have been lost to off-shoring. Forrester Research forecasts that by 2015 a total of 3.4m jobs in services will have moved abroad, but that is tiny compared with the 30m jobs destroyed and created in America every year. The trouble is that such studies allow only for the sorts of jobs that are already being off-shored, when in reality the proportion of jobs that can be moved will rise as IT advances and education improves in emerging economies.

Alan Blinder, an economist at Princeton University, believes that most economists are underestimating the disruptive effects of off-shoring, and that in future two to three times as many service jobs will be susceptible to off-shoring as in manufacturing. This would imply that at least 30% of all jobs might be at risk. In practice the number of jobs off-shored to China or India is likely to remain fairly modest. Even so, the mere threat that they could be shifted will depress wages:

Moreover, says Mr. Blinder, education offers no protection. Highly skilled accountants, radiologists or computer programmers now have to compete with electronically delivered competition from abroad, whereas humble taxi drivers, janitors and crane operators remain safe from off-shoring. This may help to explain why the real median wage of American graduates hat fallen by 6% since 2000, a bigger decline than in average wages.

In the 1980s and early 1990s, the pay gap between low-paid, low-skilled workers and high-paid, high-skilled workers widened significantly. But since then, according to a study by David Autor, Lawrence Katz and Melissa Kearney, in America, Britain and Germany workers at the bottom as well as at the top have done better than those in the middle-income ’group. Office cleaning cannot be done by workers in India. It is the easily standardised skilled job in the middle, such as accounting, that are now being squeezed hardest. A study by Bradford Jensen and Lori Kletzer, at the Institute for International Economics in Washington D. C., confirms that workers in tradable services that are exposed to foreign competition tend to be more skilled than workers in non-tradable services and tradable manufacturing industries.

According to the text, Forrester Research Prediction might be different if （）

A. outsourcing abroad is large enough to matter much

B. the proportion of jobs that can be moved will rise

C. more comprehensive factors are taken into account

D. education improvement in emerging economies plays a role