1. On many trains and buses，there are some special seats           for senior citizens. (mark)

在許多火車和汽車上，有一些專門被劃定給老人的座位。

1. (which / that are) marked out考查mark和非謂語(yǔ)動(dòng)詞作后置定語(yǔ)的用法。mark out劃分界限，標(biāo)出界限。seats與mark之間為被動(dòng)關(guān)系，故使用過去分詞�，F(xiàn)在分詞和過去分詞在句中都可以作定語(yǔ)，但在語(yǔ)態(tài)和時(shí)間概念上有區(qū)別：在語(yǔ)態(tài)上，現(xiàn)在分詞表主動(dòng)，過去分詞表被動(dòng)；在時(shí)間上，現(xiàn)在分詞表示動(dòng)作正在進(jìn)行，而過去分詞則表示動(dòng)作完成。作定語(yǔ)的分詞短語(yǔ)可以擴(kuò)展為定語(yǔ)從句。

題目來源：高考丟分題英語(yǔ) > Unit 1 A land of diversity

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