72．如果你想使你的参观艺术收藏之旅不虚此行而且有意义.你就必须留心观察.——青夏教育精英家教网——

72．如果你想使你的参观艺术收藏之旅不虚此行而且有意义，你就必须留心观察。

71．约翰斯诺在做了进一步的调查之后发现,水是导致霍乱爆发的罪魁祸首。

30．This task is too challenging for us and ________ will be needed if it is to be finished on time．

A．assistance　　 B．accomplishment　　 C．deliberation　 D．motivation

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