假如你是李明，你发现部分同学每次遇到重要考试，都会出现一些焦虑症状。请你用英语写一封信，向某学生英文报编辑反映该问题并提出建议。信的内容应包括下列要点：

焦虑症状：头晕、乏力、食欲不振等

建议：1．制定计划    2．正常作息    3．保证睡眠

其他建议(内容由考生自己拟定)

注意：1.根据以上内容写一篇短文，不要逐句翻译，可适当增加细节以使行文连贯。2.要准确使用语法和词汇；使用一定的句型、词汇，清楚、连贯地表达自己的意思；3. 词数：100个左右。开头已给出，不计词数。参考词汇：头晕dizzy(adj.)

Dear editor,

　I’m a Senior Three student of Chengdu No.7 High School. I’m writing to tell you about some

symptoms of anxiety among us students before exams.__________________________________

_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Yours sincerely, Li Ming

防静电接地电阻原则上不超过（）MΩ。

A．0.5

B．1

C．1.5

D．2