七年级6 班组织有奖知识竞赛，小年个2 用100 元班费购买笔记本和钢笔共30 件，已知笔记本每本2 元，钢笔每支5 元，那么小明最多能买钢笔 支.
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下述哪项实验不能协助诊断重症肌无力（）
A.疲劳试验
B.神经重频电刺激检查
C.新斯的明实验
D.腾喜龙实验
E.呼气诱发实验
I’m not a little tired today after giving the room a thorough cleaning and I have never had_________today.
A．as tiring a day as
B．as a tiring day
C．tiring as a day as
D．day as tiring as
