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122.Melina Kunar of the University of Warwick, and Todd Horowitz of Harvard Medical School ran a seriets of experimenis in which two groups of volunteers had to pay attention and retipond to a series of moving tasks on a computer screen that were reckoned equivalent in difficulty to driving. 华威大学的梅利娜库娜和哈佛医学院的托德霍罗威茨做了一系列试验，他们让两组志愿者注意电脑屏幕上的一系列移动任务并作出反应，这些任务被认为与开车的难度相当。 六级词汇讲解: 本句的主干是Melina Kunar...and Todd Horowitz...ran...experiments...。其中，in which two groups ofvolunteers...to driving属于介词+关系代词引导的定语从句，修饰先行词experiments，该从句中又包含一个that引导的定语从句，修饰先行词moving tasks。 reckon意为认为，此外它还含有考虑;估计之意。如： I have to reckon the cost before I book the tickets. 我得先算一下费用，然后再订票。 equivalent意为相等的;相当的。如： This qualification is equivalent to a degree. 这个资格证书相当于学位证。 英语六级考点归纳 由介词+关系代词引出的定语从句须注意以下几个问题：米关系代词which和whom在定语从句中作介词的宾语时，介词可放在关系代词之前，也可放在该定语从句中的动词之后(此时，which可用that代替，whom可用who或that代替。在口语和非正式文体中，关系代词可以省略)。如： | 
