第22题: [单项选择]The consumer group complained about ______. A. special, fees that Internet users were charged B. Federal Trade Commission C. Commercial Alert D. online search engines 参考答案:A 答案解析:依据是文章第一段第二行“asserting that many online search engines are concealing the impact special fees have on
第23题: [单项选择]治疗慢性再生障碍性贫血的首选药物是 A. 肾上腺糖皮质激素 B. 雄激素 C. 碳酸锂 D. 硝酸士的宁 E. 抗胸腺细胞球蛋白 参考答案:B