患者半年前受凉后出现咳嗽，并迁延不愈，多为干咳，偶有少量白色黏痰。体检见咽部稍充血，心肺无阳性发现。X线胸片示两下肺纹理增粗。患者问医生自己是否患了慢性支气管炎。关于慢性支气管炎的诊断下列哪项是错误的
A．肺部啰音
B．每年发病持续3个月、连续2年以上(含2年)
C．若发病症状持续不足3个月则必须有其他明确客观依据
D．排除其他心、肺疾患
E．咳嗽不是必须症状
参考答案：A
More and more Americans are going to work by bike. Do you know why more people are 41 bikes to work? We can answer the question in 42 ways. First, bikes don’t need gasoline (汽油), so it takes 43 money to use them. Second, a bike doesn’t 44 much space (空间), so it is 45 to find a place for it. And riding a bike is good for one’s 46 . People often drive their 47 to offices or to shops, but now people think riding bikes is a good way of doing sports. That’s 48 more Americans are now riding to work 49 bike, and they are 50 their own cars at home.
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