第27题: [单项选择]Who is ill in hospital A. Mary. B. Mary’s mother. C. Mary’s father. 参考答案:B 答案解析:[听力原文] M: Excuse me, can I speak to Mary F: Sorry, she isn’t in. She has gone to the hospital
第30题: [单项选择]目前推荐数字化心电图机的采样频率应不低于()。 A. 128Hz B. 250Hz C. 500Hz D. 700Hz E. 1000Hz 参考答案:C 答案解析:数字化电路心电图机采样频率应在500Hz以上,以保证高保真地记录心电图波形。
第31题:[单项选择]<br><br><br/>A.prevent<br/>B.protect<br/>C.warn<br/>D.cause<br/>参考答案:A 答案解析:解析:or,and此类连词前后应为平行结构,语意亦应基本相近,由influence the direction of their movements可推知应选prevent一词。