男性患者，60岁，有高血压痛史10年，平时血压160／90mmHg，不规律应用降压药物，因情绪激动，突然出现呼吸困难而入院。查体：血压210／110mmHg，脉率120次／分，双肺散在哮鸣音及大量水泡音，心率140次／分，节律不整，肝脾未及。心电图P波消失，代之f波，室率140次／分，节律不整，胸片双肺底呈毛玻璃样改变，心界向左扩大。血气分析：PH值7．5，氧分压56mmHg，二氧化碳分压25mmHg，血乳酸1．2mmol／L。血酮体10mmol／L。
为进一步明确诊断，下列哪项检查对诊断有帮助（）
A.化验血糖
B.化验血脂
C.超声心动图
D.肺功能检查
E.心肺吸氧运动试验
F.血电解质检查
G.肾功能检查
参考答案：C, D, E
Passage Four
| What began with the invention of the telephone in 1876 has today become a global net of cables, satellites, transmitters, and receivers that enables half the population of the planet to exchange works, data, and images in seconds. It could take less than 25 years more to give the other half of the world’s people this same power. The unified global telecommunications system, which is called "the Meganet’, represents the greatest construction project ever undertaken. If present trends continue, by early in the 21st century the Meganet will link every computer terminal, fax machine, databank, and telephone instrument on earth. Unlike its anarchic (无政府主义的) cousin the Internet, which evolved from free interaction among interest groups of computer users, the Meganet of local telephone service, long-distance lines, communications satellites, and mobile relays has been planned, constructed, regulated and largely sponsored by governments and for-profit business interests. As new materials and technologies bring reliable voice and data links to formerly isolated or closed communities, political and economic power struggles grow. The Meganet breaks long-established patterns of social identity and responsibility. Where private individuals have uncensored access to global information sources, local standards of legality or decency become difficult even to set, let alone to enforce. Economic values may shift, too. Public utility companies have long supplied electric power over miles of high-tension lines, or pumped water through underground pipelines into thousands of homes. Now they are finding that their power-line rights-of-way and physical into-home connections let them compete with cable TV and phone companies to supply information services as well. Meganet impacts are often double-edged for finance and business, too. New York’s Wall Street district lost 20% of its work force—some 100 000 jobs—in less than a decade, as computers took over tasks once performed by clerks and banks did more of their business by phone transfers and automated teller machines. |
According to the passage, what is the difference between "the Meganet" and Internet
A．Both of them are developed by some interest groups of computer users.
B．Meganet is the continuity of Internet.
C．Meganet is planned and regulated, while Internet is disorganized.
D．Meganet has fewer users than Internet.