第20题: [单项选择]{{B}}Passage One
Questions 11 to 13 are based on the passage you have just heard.{{/B}} A. The new technology used to build roads. B. The ability to transport goods over land. C. The trade in grain and cotton. D. The linking of smaller local roads into one long road. 参考答案:C 答案解析:[听力原文]
According to the speaker,what caused the growth of the US economy about 200 years ago
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第21题: [单项选择]青年女性,有静脉注射麻醉药物史,高热10余天,偶有咳嗽,少量黄痰,院外静脉滴注青霉素、头孢等抗生素一周后体温下降到38℃;回家口服药物,两天前再次发热,体温39.7℃,一直持续发热,间断咳黄色浓痰,偶有痰中带血。急查血常规白细胞总数22.4×109/L,中性粒细胞90%,胸片双肺多发片絮状阴影,并见多个空洞如患者病情危重,首选的抗生素是()。 A. 二代头孢菌素 B. 三代头孢菌素 C. 抗霉菌药物 D. 万古霉素 E. 以上都不是 参考答案:D