PART C
Directions: You will hear three dialogues or monologues. Before listening to each one, you will have 5 seconds to read each of the questions which accompany it. While listening, answer each question by choosing A, B, C or D. After listening, you will have 10 seconds to check your answer to each question. You will hear each piece ONLY ONCE.
听力原文: Balloons consist of a large flexible bag containing either hot-air or the gas that is lighter than air. The bag no neither envelope is made of silk, rubber or other suitable materials. Piloted balloons carry one or more persons; unpiloted balloons are usually used for scientific research and carry instruments to measure and record a variety of physical phenomena. Since the first successful manned balloon flied in 1783, hot-air balloons have been flown primarily for pleasure. Although the military made extensive use of them in World War I, occasionally rised for sport, the colorful globes are a more commonly thing flying in the sky during the summer when visibility is high and the flights are generally peaceful. Any gas that is lighter than air can be used to lift the balloon. Natural gas, heated air and manufactured gas can and have been used to fly balloons. The earliest balloons were filled with hot-air and often carried a metal container for burning coal to continuously heat the air. Modern balloons are usually filled with hydrogen or air heated by a small gas burner. Balloons are used primarily for two purposes, sport or scientific research. Sport balloons mostly use hot-air, they range from 10 to 20 meters in size when the bag's inflated; scientific balloons generally use hydrogen and some particular gases. They range in size from 30 to 200 meters when fully inflated.
Questions:
11. The common use of unpiloted balloons is______
12. Why do people usually fly hot-air balloons in summer?
13. What enabled the earliest balloons to fly?
(11)
A.for military purposes.
B.for pleasure.
C.for scientific research.
D.for sports.
第4题
关于肾囊肿的鉴别诊断,下列错误的是
A.多囊肾需与多发肾囊肿鉴别
B.肾肿瘤需与出血性肾囊肿鉴别
C.肾积水需与肾盂旁囊肿鉴别
D.肾髓质囊肿需与肾乳头坏死鉴别
E.多发肾囊肿需与重度肾积水鉴别
第9题
下述多发性硬化(MS)的鉴别诊断中不正确的是()。
A、需与颈椎病脊髓型(进行性痉挛性截瘫伴后索损害),大脑淋巴瘤(病情无缓解)鉴别
B、急性播散性脊髓炎:发热、昏睡,呈自限性,单向病程
C、需与乙脑及脑膜炎鉴别
D、需与脑动脉炎、脑血管畸形、系统红斑狼疮、白塞病等鉴别,详细询问病史可鉴别
E、热带痉挛性截瘫,是人类嗜T淋巴细胞病毒-1型引起的自身免疫性疾病
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