第21题: [单项选择]在静脉穿剌前对献血者手臂消毒的重要意义在于:() A. 彻底清洁献血者的穿剌部位,避免皮肤上的细菌可能污染所采集的血液,从而保证受血者用血安全 B. 彻底清洁献血者的穿剌部位,从而保证献血者献血安全 C. 彻底清洁献血者的手臂皮肤,杀灭局部病毒,保证受血者用血安全 D. 彻底清洁献血者的手臂皮肤,杀灭局部细菌及病毒,从而保证所采集的血液安全 参考答案:A
第33题: [单项选择]Questions 19 to 21 are based on the conversation you have just heard. A. It plans to send a probe to explore the moon. B. It’s NASA’s most expensive project so far. C. It’s an ambitious project. D. It’s involved in the construction of the American space station. 参考答案:C 答案解析:[听力原文]19-21 W: What do you do for a living, Frank M: I am an aerospace engineer. I have been