181.He has left his book here on_____,so that you can read it.

　　A.purpose B.intention C.aim D.meaning

　　[答案]A.purpose.

　　[注釋]on purpose是介詞習(xí)語，意為“故意地”。如用intention,則應(yīng)說by intention故意地。

　　182.The magician picked several persons from the audience and asked them to help him with the performance.

　　A.by accident B.on occasion

　　C.at random D.on an average

　　[答案]C.at random.

　　[注釋]at random(=without aim or purpose)隨便地，胡亂地：His clothes were scattered about the room at random.

　　By accident意外地;on occasion偶爾;on an average平均計(jì)算。

　　183.The open university was started in order to help those who_____having a university education when they were young.

　　A.stopped B.failed C.missed D.ceased

　　[答案]C.missed.

　　[注釋]miss doing sth.沒有做某事：I missed seeing the film when it was shown at school.(學(xué)校放映那部電影時(shí)，我沒有能去看。)

　　184.His_____of the aeroplane was correct in every detail and could really fly.

　　A.shape B.pattern C.design D.model

　　[答案]D.model.[注釋]model此句中意為“(飛機(jī)的)模型”。

　　185.If you_____your demand,then maybe you will have more chance of getting what you want.

　　A.conduct B.dismiss C.grant D.moderate

　　[答案]D.moderate.

　　[注釋]moderate(=make or become less violent or extreme)節(jié)制，緩和，減輕。