income, pay, wage& salary
income指收入； salary是靠脑力按月或年发的工薪，由 salt一词演变而来； wage指靠体力按周、日或小时付给的报酬，多用复数形式； pay可包括 salary和 wage。
【牛刀小试】（请选择本组辨析合适单词或短语填入下面空白）
Mary often does some translation work to earn extra money， which accounts for half of her______.
答案： income
insist& persist
insist坚持某种意见或主张，后接 on； persist坚持行动或行为，或固执地坚持某种意见，后接 in。
【以例服人】
He insisted on playing another game.他一定要再玩一局(球)。(当他 insist的时候,到底 play了没有,本句没明示)
He persisted in practicing hour after hour. 他坚持练习了一小时又一小时。(当他 persist的时候, practice的动作已经发生)
【牛刀小试】（请选择本组辨析合适单词或短语填入下面空白）
The officer______ that Michael did not follow the correct procedure in applying for a visa.
答案： insisted
join, take part in& attend
join后接人或团体组织名词，意为“加入”。
attend听演讲听报告而不是自己做演讲或作报告，只是参与不起积极作用。
take part in表参加某项工作或事业，并在其中起一定作用。
【一言辫异】 Since he joined the group, he has had so many meetings to attend and seldom takes part in the party.
【牛刀小试】（请选择本组辨析合适单词或短语填入下面空白）
4. Though you’ve got a tight schedule these days, I would be grateful if you could afford time to______ our meeting today.
答案： attend
Amy______ a painting group but didn’ t seem to fit in, so she left.
答案： joined
know, recognize& know of
know表示认识或熟悉某人，某事，某地。
recognize表示能认出原来认识或曾经见过的人，物及地方，以及承认某事物的客观存在。
know of亦可解作 know about，表示“知道（有），听说”的意思，指间接地获得的信息或情况，相当于 hear of。
【一言辨异】 If I knew him, I could surely recognize him but I don’ t even know of him. 如果我认识他，我当然能认出来，但我甚至没有听说过他。
【牛刀小试】（请选择本组辨析合适单词或短语填入下面空白）
She didn’ t______ the man who hit her because she could only make out a dark shape moving towards her.
答案： recognize
lay& lie
lie(躺，位于) lay, lain
lie(撒谎) lied, lied【谐音记忆】“撒谎赖不赖呀，赖的，赖的。”
lay(放置，下蛋) laid, laid【谐音记忆】“下蛋累不累呀，累的累的。”
【牛刀小试】（请选择本组辨析合适单词或短语填入下面空白）
The living room is clean and tidy, with a dining table already______ for a meal to be cooked.
答案： laid
leather& skin
skin主要指毛皮、兽皮、果皮或人的皮肤等。
leather主要指经过加工处理的“毛皮”即“皮革”。
Obama’s success in presidential election proves that the color of one's______ shouldn't be a barrier to success.
答案： skin
lecture& speech
lecture指有准备的专题演讲，尤指学术性讲演及高等学校教师的讲课。
speech泛指为听众而作的讲话，可以是有准备的也可以是无准备的。
【牛刀小试】（请选择本组辨析合适单词或短语填入下面空白）
The professor could tell by the blank look in Maria’s eyes that she didn't understand a single word of his_______.
答案： lecture
