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磷钨酸—镁试剂可选择性地沉淀( )
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The molecules of carbon dioxide in the Earth’s atmosphere affect the heat balance of the Earth by acting as a one-way screen. (1) these molecules allow radiation at visible wavelengths, where most of the energy of sunlight is concerned, to pass (2) , they absorb some of the longer-wave length, infrared emissions radiated from the Earth’s surface, radiation that would (3) be transmitted back into space. For the Earth to maintain a constant average temperature, such emissions from the planet must (4) incoming solar radiation. If there were no carbon dioxide in the atmosphere, heat would (5) from the Earth much more easily.Today, (6) , the potential problem is too much carbon dioxide. Could the increase in carbon dioxide (7) a global rise in average temperature, and could such a rise have serious (8) for human society Mathematical models that allow us to calculate the rise in temperature as a function of the increase (9) that the (10) is probably yes.One mathematical model (11) that doubling the atmospheric carbon dioxide would raise the global mean surface temperature by 2.5℃. This model assumes that the atmosphere’s relative humidity remains constant and the temperature decreases with altitude at a (12) of 6.5℃ per kilometer. The assumption of constant relative humidity is important, because water vapor in the atmosphere is another (13) absorber or radiation at infrared wavelengths. Because warm air can hold more (14) than cool air, the relative humidity will be constant (15) the amount of water vapor in the atmosphere increases (16) the temperature rises. (17) , more infrared radiation would be absorbed and reradiated (18) to the Earth’s surface. The resultant warming at the surface could be expected to melt snow and ice, (19) the Earth’s reflectivity. More solar radiation would be absorbed, (20) to a further increase in temperature. Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C, and D on ANSWER SHEET 1.19（）
Passage OneQuestions 26 to 28 are based on the passage you have just heard.
英国的A公司于2002年1月10日在我国中请电热水器外观设计专利（申请号为012003），并于同年4月30日由我国专利局授予专利权。重庆电热水器二厂于2002年12月向我国专利局专利复审委员会提出宣告该项专利无效的请求。理由是1988年9月18日的确英国出版的刊物《家庭日用品》第1180号刊出的4幅电热水器外观设计的照片，与A公司的产品外观设计相类似。因而，根据我国《专利法》的规定，A公司的电热水器外观设计属于公知范畴。专利复审委员会受理请求人的申请后，于2003年1月将无效宣告请求书的副本和有关文件副本送达A公司，要求该公司于三个月内陈述意见。A公司未加理会。同年6月9日，专利复审委员会向双方当事人发出无效宣告请求审查通知书，要求双方在三个月内提交答复意见。A公司在上述规定期限内仍未做出答复。问题：（1）重庆保温瓶二厂能否对A公司的电热水器外观设计专利提出无效宣告请求（2）根据案情介绍，专利复审委员会对此应如何处理？为什么
Questions 11 to 18 are based on the conversation you have just heard.
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