问题
单项选择题
仅在局部增殖，不引起病毒血症的是
A．麻疹病毒
B．风疹病毒
C．乙型脑炎病毒
D．流行性感冒病毒
E．脊髓灰质炎病毒
答案
参考答案：D
解析：[解题思路] 流感病毒由血凝素与呼吸道黏膜上皮细胞受体结合，在细胞内增殖，引起呼吸道症状，病毒不入血，全身症状与病毒代谢过程产生的毒性物质有关。[命题规律] 考察“流感病毒的致病特点”。必须掌握。
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仅在局部增殖，不引起病毒血症的是
A．麻疹病毒
B．风疹病毒
C．乙型脑炎病毒
D．流行性感冒病毒
E．脊髓灰质炎病毒
参考答案：D
解析：[解题思路] 流感病毒由血凝素与呼吸道黏膜上皮细胞受体结合，在细胞内增殖，引起呼吸道症状，病毒不入血，全身症状与病毒代谢过程产生的毒性物质有关。[命题规律] 考察“流感病毒的致病特点”。必须掌握。
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| Lang Lang is a world-class young pianist who grew up in Sheng yang. He went to a piano school in Beijing when he was just eight. "You need fortune," his father said."But if you don't work hard, no 1 will come." What made him sad was 2 his piano teacher in Beijing didn't like him. "You have no talent (天赋). You will never be a pianist." 3 a nine-year-old boy, Lang Lang was badly 4 . He decided not to be a 5 any more. For the next two weeks, he didn't play 6 piano. Wisely, he father didn't push, but waited. Luckily, the day came when his teacher asked him to 7 some holiday songs. He didn't want to, but as he placed his fingers on the piano keys, he realized that he 8 show others that he had 9 .That day he told his father what he had been waiting to hear-that he wanted 10 with a new teacher. 11 that moment on, everything turned around. He started 12 competitions. In the 1994 International Young Pianists Competition,when it 13 announced that Lang Lang had won, he was too 14 to hold back his tears. Soon 15 was clear that he couldn't stay in China forever-he had to play on the world's 16 stages. In 1997 Lang Lang 17 again, this time to Philadelphia, U.S.. There he spent two years practising, and by 1999 he had worked hard enough for fortune to take over. After his 18 performance at Chicago's Ravinia Festival, gigs (特邀演出) in Lincoln Center and Carnegie Hall started breaking. 19 Lang Lang worked to reach the place where fortune spots (发现) 20 , and lets him develop. | ||||
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