acid['æsid]
n. 酸；<俚>迷幻药
adj. 酸的；讽刺的；刻薄的
any of various usually liquid substances which can react chemically with and sometimes dissolve other materials

describes a remark or way of speaking that is cruel or criticizes something in an unkind way

acute[ə'kju:t]
1.尖的，锐的，锐利的
2.尖锐的，敏锐的 敏感的，灵敏的 （眼尖）
3.(疼痛、妒忌等)剧烈的，激烈的，强烈的，厉害的 强烈：程度很高的
4.严重的；紧要关头的；危急的；极困难的
An acute pain or illness is one that quickly becomes very severe
If a bad situation is acute, it causes severe problems or damage
She felt acute embarrassment/anxiety/concern at his behaviour.
The problem of poverty is particularly acute in rural areas.

He suffers from acute depression.
他患有严重的抑郁症。
It is urgent that the acute problem of air pollution in the city be solved.
该城市空气污染这一严重问题亟须解决。

acerbic[ə'sə:bik] =acerb
adj. 尖刻的（等于acerb）；酸的；辛辣的
criticizing someone or something in a clever but cruel way

You shouldn't speak such acerbic words.
你不应该讲如此尖酸的话。
The letter was written in her usual acerbic style.
这封信是用她惯常的尖刻语调写的。

acrid['ækrid]
adj. 辛辣的；苦的；刻薄的
r l n 互换以前讲过，m n 有时也可互换 im=in

acme['ækmi]
n. 顶点，极点；最高点

acne ['æknɪ]
【医】痤疮;粉刺

acupuncture['ækju,pʌŋktʃɚ]
针刺,针刺疗法[U]
对...施行针灸治
punctual点状的

讲个笑话给你听

Once there was a blind. One day when he was walking, he stepped the head of the dog who was sleeping. The dog barked for a while. The blind man went on for miles, this time he stepped the other dog's tail, so this dog barked. The blind man had thought that it was the first dog, so he said in surprise, It's a wonder that the dog is so long.

从前有个瞎子。一天，他正在行路时踩着了一只正在睡觉的狗的脑袋，狗汪汪汪地叫了一阵。这人又往前走，这回踩着的是另外一只狗的尾巴，狗又汪汪汪地叫起来。瞎子以为还是那条狗，惊诧地说：奇怪，这只狗可真够长的。

昨日重现
自己亲自做下，答案见评论

2002年1月CET-6真题
A human's eyesight is not as _____ as that of an eagle.

A.eccentric
B.acute
C.sensible
D.sensitive

1996年1月CET-6真题
Although most birds have only a negligible sense of smell they have _____ vision.

A.vigorous
B.exact
C.acute
D.vivid

更多精彩，敬请关注http://www.kekenet.com/