[单项选择]The shrinking range poses （）to Africa’s elephants A. a graver threat that is long-term B. long-term the gravest threat C. the gravest long-term threat D. a long-term threat graver
第5题: [单项选择]有关吸入麻醉药的描述，错误的是（）。 A. 异氟醚引起呼吸抑制比氟烷明显 B. 采用N2O麻醉时，吸入氧浓度宜在30%以上 C. 乙醚麻醉易引起血糖降低 D. 安氟醚可明显增强肌松药效果 E. 长期吸入N2O可能对红细胞生成系统产生损害 参考答案:C
第6题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. In Professor Brown’s office. B. In a university bookstore. C. In a publisher’s office. D. In a shipping company office. 参考答案:B 答案解析:[听力原文]
W: Excuse me, I’m looking for the textbook for Professor Brown’s course.
M: I’m afraid they
