He was mischievous when he was a child.

　　We expect healthy children to be mischievous at times.

　　142. monopoly   n. 垄断，垄断者

　　Scientific achievement is not a male monopoly.

　　They claim to have a monopoly on the truth..

　　He owns much monopoly capital.

　　In many countries tobacco is a government monopoly.

　　143. mortgage   n.  &   v.  抵押

　　He repays his mortgage in monthly installment

　　他每月分期付款偿还抵押借款

　　The girl had to mortgage her golden necklace to the old man for $ 1000.

　　女孩用她的金项链向老人押借一千美元。

　　I can buy the house only if a mortgage for $ 20,000 is obtainable.

　　只要能押借到两万美元，我就能买这房子。

　　144. nomination  n.  提名，任命

　　How many nominations have been announced?

　　He has a good chance of winning the nomination.

　　Who will get the nomination for president?

　　How many persons have been nominated so far?

　　145. notorious  adj.  声名狼藉的

　　The notorious criminal has been sent to prison.

　　Peter is a notorious cry-baby.

　　His noisy parties mad him notorious in the community.

　　146. nurture   vt.  养育，教育  cultivate

　　She nurtured the child as if he had been her own.

　　The book tells us how to nurture the puppy.

　　Schools are responsible for nurturing the minds of the children.

　　We must nurture the young so that they will develop into good citizens.

　　147. be obsessed with\by   通常用被动语态，指恐惧，固执或错误的观念

　　“占据心思，不断地困扰”

　　He was obsessed with fear of unemployment.  被失业的恐惧所困扰

　　She is obsessed with marks.

　　The boy was obsessed by the idea the his classmates looked down upon him.

　　148. obstacle  n. 障碍，妨害物

　　obstacle指“阻碍前进的东西或状况”;

　　impediment 指“妨碍正常活动而使前进受阻的事”, 特指“口吃”

　　obstruction 指“阻碍整个通道的阻塞物”

　　hindrance 指“阻碍事物前进的人或物”

　　Her father's opposition remained only their obstacle.

　　He is suffering from a speech impediment.

　　Your interference is an obstruction of justice.

　　lt was proved a hindrance to our progress.

　　149. optimistic  adj.  乐观的    pessimistic 悲观的

　　He is optimistic about the future.

　　The public mood is optimistic and excited.

　　They are feeling optimistic these days.

　　The stockholders are optimistic about the company.

　　150. optimum  adj.  最佳的，最适宜的  best

　　It is the optimum temperature for the growth of plants.

　　That’s the optimum season for the birds to reproduce.

　　We try to offer the optimum surroundings

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