18. a piece of cake: (informal) sth very easy to do (口)极容易做的事情

[例句]：He thought his first solo flight a piece of cake.
他认为他的第一次飞行是件轻而易举的事情。
Translation is anything but a piece of cake. 翻译绝非易事。

19.echo vt. 附和，重复；发出回声
　　　　 n. 回声

[例句] He echoed every word of his superior.　他随声附和他上级的每一句话.
Our voices echoed in the empty room. 我们的声音在空房间里回响。
The empty hall echoed.　空空的大厅里发出回声。
echo chamber 回声室

20.ad. n. 广告 advertisement的缩略形式。

[例句] They like advertisements which show women in office, planes, and cars.
妇女们喜欢那些表现妇女在办公室工作、乘飞机旅行、驾驶着汽车等情形的广告。
Ad helps to sell goods. 广告(能)帮助推销货物。

21.inform vt. 告知 ，通知 [同]tell

[例句] The headmistress informed us that the school would be closed for one day next week.
女校长告诉我们下星期学校将停一天课
[记忆法] 派生法：information n. 通知，信息 informative adj.供给消息的，给予知识的 informant n.告发者（特指告发罪犯和逃犯）

[考 点]习惯用法：inform sb. (of sth.)/(that)…通知某人…… 如：
Have you informed them of your intended departure?
你通知他们你想离去了吗？
I wasn't informed of their decision until a week later.直到一个星期以后他们才把决定告诉我。
He informed us that he would not be able to attend out meeting.
他告诉我们说他不能来参加会议了。
We have informed that two prisoners had escaped.
我们听说有两个囚犯逃跑了。

[典型考题]I'm amazed to hear that she was the one who ___ her husband. [B]
A. informed B. informed on C. informed of D. informed about

[试题分析] 译文：听说是她控告她的丈夫令我吃惊。①inform sb. of/about sth. 告诉某人某事 ②inform against/on sth. 控告，告发某人。

22.porch n. 门廊 [同]doorstep

[例句]Passing through the porch, one reached the garden. 穿过门廊就到了花园。

[记忆法]词形比较：port n. 港口 pork n. 猪肉

[考 点]在美国英语中，porch也指走廊。

23 even as: just at the time when.正当，恰在……的时候

[例句]Even as I gave the warning the car skidded.
正当我提出警告时，那车子滑到一边去了。
Even as we gathered in the last bundles of wheat, it began to rain.
我们刚把最后几捆麦子收进，天就下雨了。

24.armload n. 一抱（之量） [同]armful

[例句]an armload of laundry.　一抱要洗的衣服

[记忆法] 合成法：armchair n. 扶手椅 armhole n. 袖孔; truckload一卡车的量, shipload 一船的量

25.walk n. 人行道 [同]pavement

[例句] There is a walk along the river. 沿小河边有一条人行道。

[记忆法]walk作动词时为行走的意思。

[典型考题]He lives within a short _____of his place of employment. [B]
A. place B. walk C. distance D. run

[试题分析] 译文：他住的地方离工作的地点很近。place地方，地点，不能用short修饰；walk指步行能到达的地方，走的距离。作"散步"讲时，动词用take，take a walk/fond of long walks喜欢长距离散步；distance距离，不能与句子的后半部分搭配，distance后常接借词to；run跑，within a short run是错误的搭配。

26.unnaturally adv. 不自然地

[例句] He smiled at us unnaturally. 他不自然地冲我们笑。

[记忆法] 派生法：前缀un-不造成此类地转变，而是引起意思上地变化。再如：important--unimportant
real--unreal fair--unfair

27.quaver vi. 颤抖 【同】shake，tremble

[例句] She spoke in a quavering voice.她用颤抖的声音说话。
He spoke in a voice that quavered.他用一种颤抖地声音说话。

[辨析]quaver, shake, tremble, quiver, shudder和wobble：
quaver表示火焰、声音的"颤抖"：
the quavering flame of the candle
shake是泛指的"抖"，通常是不规则的颤动。
The house shook as the heavy truck went past. 重载的卡车经过时，房子摇晃起来。
tremble紧张恐惧之意：
Her body trembled with fear.他的身体因为恐惧在颤抖。
quiver颤动，特别是树叶，虫翼，人的嘴唇等
The little girl's lips quivered as she tried not to cry. 这个小女孩的嘴唇在颤抖，试图不哭出来。
shiver尤其是指"冷得发抖"：He came into the room snow-covered and shivering.
他进屋得时候浑身是雪，冷得发抖。
shudder指突然的、强烈的抖动，特别是无意识的动作：
She shuddered uncontrollably at the dead body.当她看到死尸的时候不禁毛骨悚然。
wobble尤指物体的不稳定，或是肉、果冻类的物质的"颤动"：
The table wobbled because one of the legs shorter than the others.因为桌子有一条腿短，所以放不稳。

28.dime n. （加拿大及美国银币）一角

[例句] Can you give me a dime for two nickels?　我给你两枚五分镍币换你一枚一角银币,成吗?

[记忆法]词形比较：dim adj. 模糊的

[考 点] 习惯用法 ：dime store廉价商品店，小商品店

29.drugstore n. 药店、杂货店

[例句] The OTC medicines are sold at drugstores. 这些非处方药在药店里有售。

[记忆法]联想记忆：a chemist's shop 药店 grocery n. 食品杂货店

30.grocery n.食品杂货店 [同]drugstore

[例句] The grocery near us is great convenience to us. 我们附近的杂货店极大地方便我们。

[记忆法] 派生法：grocer n. 杂货商 groceries n. 杂货