该药物的主要作用机制是
A. 抑制转肽酶
B. 抑制DNA回旋酶
C. 作用于核糖体50S亚基，抑制蛋白质合成
D. 作用于核糖体30S亚基，抑制蛋白质合成
E. 抑制分枝菌酸合成酶
Which of the following about air pollution does the passage suggest？
A. Further attempts to reduce emissions from gasoline-fueled vehicles will nor help lower urban air pollution levels.
B. Attempts to reduce the pollutants that an individual gasoline-fueled vehicle emits have been largely unsuccessful.
C. Few serious attempts have been made to reduce the amount of pollutants emitted by gasoline fueled vehicles.
D. Pollutants emitted by gasoline-fueled vehicles are not the most critical source of urban air pollution.
引起毒素型食物中毒的病原菌是()
A. 金黄色葡萄球菌
B. 肠炎杆菌
C. 鼠伤寒杆菌
D. 变形杆菌
E. 空肠弯曲菌
综观全文的内容，以下推断合乎原文意思的一项是：
A. 作者对古人步行要受礼法的严格限制颇不以为然。
B. 汉末之后人们对步行美的崇尚象征着儒学的衰亡。
C. 写儒道两家对步行的不同态度，表明作者尊道贬儒。
D. 作者写作本文主要是为了介绍一些历史文化现象。
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