An economist is someone who knows a lot about how goods and wealth are produced and used. Food, for (31) , is a kind of goods. Everyone eats food, but the average person does not think much (32) all the things that must happen before (33) appears on his plate.
Another example is the paper this article is printed on. (34) started as wood on a tree very far from (35) . Men and machines made the wood (36) paper, which had to be packaged and carried (37) trucks and put into stores. At every step in the process people had to be paid for their work; money had to (38) used for buying and repairing the machines, and so on. Of course, everyone (39) had to make (40) , too. Even a very simple thing (41) a piece of paper has a long story (42) it. Economists try to understand how all the parts of the long story are related.
(43) economist learns how to guess (44
| With Airbus’s giant A380 airliner about in to take
to the skies, you might think planes could not get much bigger — and you would
be right. For a given design, it turns {{U}} (21) {{/U}}, there comes a
point where the wings become too heavy to generate {{U}} (22) {{/U}} lift
to carry their own weight. {{U}} (23) {{/U}} a new way of designing and
making materials could {{U}} (24) {{/U}} that problem. Two engineers
{{U}} (25) {{/U}} University College London have devised an innovative
way to customise and control the {{U}} (26) {{/U}} of a material
throughout its three-dimensional structure. In the {{U}} (27) {{/U}} of a wing, this would make possible a material that is dense, strong an A. next B. then C. after D. since [简答题]简述EDTA滴定法试验步骤。
[单选题]基础代谢率的正常范围是不超过正常平均值的( )
A.±5%～±10% B.±10%～±15% C.+10%～-15% D.±20%～±30% E.±30%～±40% [单项选择]
Here is the story of rubber. From the earliest time it was common knowledge to the Peruvians(秘鲁人)that when a cut was made in the outside skin of a rubber tree, a white liquid like milk came out, and that from (21) a sticky mass of rubber might be made. This rubber is (22) when warm, so that it is possible to give it any (23) . The Peruvians made the (24) that it was very good for keeping out the wet. Then in the early 1800’s, the Americans made use of it for the first time. First they made overshoes to (25) their feet dry. Then came a certain Mr. Mackintosh, who made coats of cloth covered with natural rubber. From that day to this we have been coating cloth with rubber as Mr. Mackintosh (26) , and our raincoats are still named after (27) . [单选题]氨基酸从小肠肠腔进入肠上皮细胞内的过程属于
[多项选择]民国时期，影响较大的私立幼稚园有（）。
A. 集美幼稚园 B. 香山慈幼院 C. 鼓楼幼稚园 D. 燕子矶幼稚园 [单选题]甲公司自建网站从事网络销售,没有明示用户信息查询、更正、删除以及用户注销的方式、程序,并在用户要求注销时强加种种不合理条件。市场监督管理部门除责令甲公司限期改正外,可以对其处以罚款的最高数额是( )
A.10万元 B.50万元 C.1万元 D.200万元 我来回答: 提交
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