1、ask
ask for 要求，请求
ask sb.for sth.向（某人）请求（要求）……
She asked for some advice on how to learn English well.
2、at
at表示速度、价格、利率
at a high/low price以高价/;低价；at 40 miles an hour 以每小时40英里的速度；at a high/low speed以高速/慢速；at an ordinary speed 以普通速度；at full/top speed以全速/高速；at a speed of 以……速度。
[应用]完成句子
①公司决定以较低的价格将这批电视卖掉。
The company decided to sell the TV sets _ __ _ __ __ _ 。
②火车正以每小时150英里的速度前进。
The train was running ______ _____ ______ _______150 miles an hour .
Key:①at, a, low, price②at,a, speed,of
“at+名词”表示“在进行，从事”
at work 在工作；at table在吃饭；at play 在做游戏；at sea 出海；at university/college在上学;at night school在上夜校；at dinner/table在吃饭；at peace处于和平状态；at war在交战，在打仗
[应用]完成句子
①别人在工作，不要吵闹。Don’t make any noise while others are ______ ________.
②孩子们在游戏，而他们的父母正在吃饭。
The children were ______ ________ while their parents were_______ _______.
Key:①at, work②at,play,at,dinneras
3、as…as
as many as 和……一样多/多达；as much as 和……一样多/多达（注意：many指可数的量，much 指不可数词的量）；as high as 和……一样高/高达；as thick as 和……一样厚/厚达；as long as 一样长/长达;as deep as 一样深/深达；as early as 一样早/早在……时候，如：
We have as many books as they.我们的书和他们的一样多。/The great fire burned down as many as twenty buildings.大火烧毁的大楼多达20座。
[应用]汉译英
①新桥与旧桥一样长。/这种鱼可长到长达15英尺。
②这座山和远处的另一座一样高。/这座山高达4000米。
Key:①The new bridge is as long as the old one./The kind of fish can grow as long as 15 feet.
②This mountain is as high as another one in the distance./This mountain is as high as 4,000 metres.
as…as possible:as…as one can尽可能地…….
①I’ll come back as soon as possible.我尽可能地……
②Get up as early as possible tomorrow morning. 明天早晨尽量早起。
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