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问题 单项选择题

在对水质、土壤等样品中进行有机污染物监测分析时，一般使用正己烷、苯、醚、乙酸乙酯或二氯甲烷等溶剂进行萃取，但（）两种溶剂具有致癌性，为控制使用的溶剂

A.正己烷，苯

B.苯，二氯甲烷

C.苯，乙酸乙酯

D.二氯甲烷，正己烷

答案

参考答案：B

改错题

错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧）, 并在其下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1、每处错误及其修改均仅限一词；

2、只允许修改10处，多者（从第11处起）不计分。

Yesterday afternoon Frank Hawkins was telling me about his experience as a young man. Before he retired,Frank was a head of a very large business company,but as a boy he used to working in a small shop. It was his job to repair bicycles and at this time he used to work fourteen hours a day. He saved money for years but in 1958 he bought a small workshop of his own. In his twenties Frank used to make spare parts for aeroplanes. At that time he had two helpers. In few years the small workshop had become a large factory which had employed seven hundred and twenty-eight people. Frank smiled when he remembered his hardly early years and the long road to success. He was still smiling when the door open and his wife came in. She wanted him to repair her grandson's bicycle！
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单项选择题 共用题干题

患者男性，55岁，体检发现血压增高，后多次测得血压波动在140～150mmHg/100～105mmHg左右，无头痛头晕、眼花耳鸣、心前区不适等症状，既往体健。

该患者应诊为（）。

A.高血压病1级

B.高血压病2级

C.高血压病3级

D.临界高血压

E.正常偏高血压
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