大学英语四六级考试迫在眉睫，你准备好了吗?词汇作为四六级考试的基础，必然是大家关注的焦点。为了帮助大家在最短时间内起到最好的效果，小编特为大家总结了四级考试中经常出现的高频单词或短语，希望能祝大家一臂之力!

　　I ask after 询问,问候 He ask after you / your health.

　　E ask for 请求,要求

　　I attached to 系,贴,连接;附属;依恋 1.I was attached to the naval college as a special instructor for six months. 2. I am very attached to that car.

　　E pay attention to 注意 You must pay attention to the teacher.

　　A on (the/an) average 平均,一般说来 On average we receive five letters each day.

　　E right away 立刻,马上 Do it right away!

　　I back and forth 来回地,反复地 The chair rocked back and forth.

　　A back down/off 放弃,让步,退却 I saw that she was right, so I had to back down.

　　A back of 在...后部,在...背后

　　I.A back up 支持,援助;

　　A.倒退,后退 The policeman wouldn't have believed me if you hadn't backed me up.

　　I based on 以...为基础 His argument is based on facts.

　　I on the basis of 以...为基础 Society rested on the basis of the family.

　　E to begin with 首先,第一点 =in the first place:We can't go.To begin with, it's too cold.Besides, we've no money

　　I on behalf of 代表,为了 The president is ill, so I'm speaking on his behalf.

　　I make believe 假装 The children are making believe that they're princes and princesses.

　　I at best / at the best 最好,充其量 At best the company will lose money this year-at worst it may have to close down.

　　I get the best of 战胜;从中得到最大益处 They got the best of the other team at last.

　　E make the best of 充分利用,妥善处理 to make the best of a bad job; He will make the best of the situation.

　　E do/ try

　　one's best 尽力,努力 We must try our best to overcome the difficulty.