第14题: [单项选择]单从血检看,急性有机磷农药中毒患者全血胆碱脂酶活性为多少时,可诊断为重度中毒() A. 10%~30% B. 30%~50% C. 50%~70% D. 70%~80% E. 80%~90% 参考答案:A 答案解析:轻度中毒:头晕,头痛,恶心,呕吐,出汗,胸闷,视力模糊,无力等,瞳孔可能缩小。全血胆碱酯酶活力下降到正常值的70%~50%。中度中毒:除上述以外,肌束震颤,瞳孔缩小,轻度的呼吸困难,大汗,流涎,腹痛,
第22题: [单项选择]According to the passage, when could people start using a maglev commerciaily A. In 5 years. B. In 10 years. C. In 20 years. D. In more than 20 years. 参考答案:B 答案解析:[注释] 根据第一个句子“The next decade could see…”,可以确认答案。
第29题: [单项选择]It seems that there is a fall in the crime rate. A. drop B. rise C. ability D. increase 参考答案:A 答案解析:本题考查常见的名词。fan降落,落下;drop落下,掉下;rise上升;ability能力;increase增加。所以正确答案为A。