53.A　 keep one's mind on sth專心做某事;keep sth in mind記住某事。

53.---Tom, keep your_____ on your studies.

　　 --- Sure, mum. I'll keep that in_____.

A. mind;mind　 B.heart;headC. brain; mind D.heart;brain

52.D course在此意為“(一)道(菜)”，“(一)盤(pán)(菜)”。

52. ---What do you think of the dinner in Mr Brown's?

---Oh, great! We have never had a better one. It's a dinner of twenty ____.

A. drinks　　 B. people　 C. tables　 D. courses

51.B wooden作定語(yǔ)，意為“用木頭(塊)制成的”，wood作定語(yǔ)，意為“就木頭本身制成的”。從該題題干可看出，在木頭上雕刻各種花樣，應(yīng)為wood carving。

51. His job is to sell the ____ carvings in the ____ department of the company.

A. wooden; sales B. wood; salesC. wood; saleD. wooden; sale

50.C 考名詞辨異。A、B、D三個(gè)選項(xiàng)都是不可數(shù)名詞，不可與a single連用。

50.1 haven't got a single ______from Aunt Mary since I last saw her.

A. advice　 B. news　 C. message　 D. information

49. sign與mark的區(qū)別是：sign 的意思是“跡象”、“征兆”gesture or movement made with the hand, head, etc, used to give information, a command, etc(用手或頭等做出示意動(dòng)作以傳遞信息或命令等)，mark 的意思是 written or printed symbol or figure, line etc made as signor an indication of sth(書(shū)寫(xiě)與印刷的符號(hào)或圖、線等記號(hào))。根據(jù)此二詞的語(yǔ)義區(qū)別以及常識(shí)可知

48. 本題中的and連接前后兩個(gè)what引導(dǎo)的從句，而且根據(jù)句意“他說(shuō)的和他做的不一樣”，可見(jiàn)這兩個(gè)what從句的意思是各自獨(dú)立的，因此謂語(yǔ)動(dòng)詞用復(fù)數(shù)形式。