选择题：It took me a long time before I was able to fully appreciate what they __ for me

题目内容：

It took me a long time before I was able to fully appreciate what they __ for me.

A. had done

B. did

C. would do

D. were doing

参考答案：

(3)正常时,用a刺激神经会引起骨骼肌收缩;传出部分的某处受损时,用a刺激神经,骨骼肌不再收缩,根据

（3）正常时，用a刺激神经会引起骨骼肌收缩；传出部分的某处受损时，用a刺激神经，骨骼肌不再收缩，根据本题条件，完成下列判断实验：①如果______________，表明传出神经受损。②如果 ______

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The underlined words “tipping points” most probably refer toA. freezing points B. burning points C. m

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（11分）阅读材料，回答问题。志愿者活动在国际社会已有几十年的历史，在其影响下，我国的青年志愿者活动也走过了十几年的光辉历程。.从“乐善好施”的先哲古训，到“助人为乐”的雷锋精神，无数仁人志士早已吟唱出

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