If the only reading you ever do is the novel or magazine, thespeed at which you read probablydoes not matter very much. But if you have to read a great deal for study, youwill appreciate the benefits of being able to read more quickly. Here are sometips to help improve your reading speed.?

這是2021年新高考考試英語全國卷2的閱讀理解七選五中的一段。請問句中的 at which 是引導(dǎo)定語從句嗎？感覺結(jié)構(gòu)有點(diǎn)奇怪。

沒錯，at which you read 是定語從句，修飾 thespeed。意思是“你閱讀的速度”。這里用介詞 at，是由于 speed 一般搭配 at（表示“以……速度”）。又如：

The police measured thespeed at which the car was travelling. 警察測定那輛汽車行駛的速度。

It was the speed at which itall happened that shocked me. 令我感到震撼的是整個事情發(fā)生得這樣之快。

The driver miscalculated thespeed at which the other car was travelling. 司機(jī)對另一輛車的車速估計(jì)錯誤。