第3题: [单项选择]The last half of the nineteenth century ______ the steady improvement in the means of travel. A. has witnessed B. was witnessed C. witnessed D. is witnessed 参考答案:C 答案解析:[解析] 根据主语可判断出时间为过去时。
第8题: [单项选择]They have developed techniques which are ______ to those used in most factories. A. more B. better C. greater D. superior 参考答案:D 答案解析:短语be superior to优越于……。又如：He thinks he is superior to us because his father is an important person．他因
第11题: [单项选择]临床上中度脱水，其缺水量占体重的百分比为（）。 A. <1% B. 2%～3% C. 4%～6% D. 7%～8% E. >9% 参考答案:C 答案解析:轻度缺水：除有口渴外，多无其他症状；缺水量为体重的2%～4%中度缺水：有极度口渴，伴乏力、尿少、尿比重高唇干舌燥、皮肤弹性差、眼窝凹陷，常有烦躁；缺水量为体重的4%～6%重度缺水：除上述症状外，出现躁
