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David had prepared carefully for the che...

David had prepared carefully for the chemistry exam, as he wanted to be sure of passing it at the first _____.

A. experiment      B. intention  C. aim    D. attempt

 

D 【解析】 试题分析:考查名词辨析。句意:大卫已经为化学考试做了精心准备,因为他想确定第一次尝试就通过。A实验;B意图,目的,打算;C目标,目的;D尝试,企图。“化学考试”不是一次实验,排除A;B、C两项在此与句意不符;at the first attempt初次尝试,故选D。 考点:考查名词辨析  
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假设你是一名高中生,名叫李华。因为老师担心同学们浏览不健康的网站,学校关闭了电脑教室的上网功能,同学们感到很郁闷。请你给校长写一封建议信。内容包括:

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