1.cooperative
adj. 合作的，協作的；合作社的<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
2.co-ordinate
adj. 同等的，並列的
n. 同等的人或物；（數）座標
vt. 使同等；使協調，調合
co-ordinate ideas 協調各項意見
3.correctly
adv. 正確地，合適地
[同]rightly
4.correlate
v. （使）相互關聯
They find it difficult to correlate the two sets of figures / to correlate one set with the other.
他們發現很難使這兩組數字相互聯繫。
[同]associate
n. 相互關聯的事物；相互依存的人
[難點]
correlate sth. with / to sth. 把某物與某物聯繫起來
5.correlation
n. 相互關係，相關性
the correlation between climate and vegetation 氣候與植物的相互關係
6.correspondence
n. 相符，一致，相似
There is not much correspondence between their ideals and ours.
他們的理想與我們的沒有什麼相似之處。
n. 通信，信件
He has a great deal of correspondence to deal with .
他有大批信件要處理。
[難點]
in correspondence with 與…通信；與…相符
I have been in correspondence with him about the problem.
關於這問題，我和他一直書信往來。
7.corrosion
n. 腐蝕，侵蝕；鏽，鐵鏽
8.corrupt
adj. 腐化的，不道德的
v. （使）腐敗，賄賂，敗壞
The candidate corrupted voters. 這個候選人賄賂選民。
[同]bribe
9.cosmic
adj. 宇宙的
a cosmic rocket 宇宙火箭
[同]universal
adj. 廣大無邊的
10.cosmos
n. 宇宙
[同]universe
n. 完整的體系；秩序，和諧
11.couch
n. 長沙發，睡椅，臥榻
retire to one’s couch 就寢
12.counsel
n. 忠告，勸告
You had better follow his counsel. 你最好聽從他的忠告。
[同]advice
n. （單復同）法律顧問，律師；協商，勸告
vt. 勸告，忠告
He counselled our acting at once. 他勸告我們立即行動。
[同]advise
[同]
counsel (doing) sth 建議（做）某事
counsel sb. to do sth. 勸告（建議）某人做某事
hold/take counsel with sb. 聽取某人的意見
take counsel together 共同商議
13.courageous
adj. 勇敢的，無畏的
It was courageous of him to oppose his chief. 他敢反對他的上司，真是勇敢。
[同]brave
14.courteous
adj. 有禮貌的，殷勤的（to）
[同]polite
15.courtesy
n. 禮貌，謙遜，好意
He is liked very much because of his courtesy.
他由於彬彬有禮而頗得人們喜愛。
[難點]
be courtesy of 經…同意，由於…的好意，由…提供
a radio programme presented by courtesy of …. 由…所提供的廣播節目
16.coward
n. 懦夫
六級範文：
Directions: For this part, you are allowed thirty minutes to write a composition on the topic Don’t Hesitate to Say “No”. You should write at least 100 words and you should base your composition on the outline (given in Chinese) below:
1. 別人請求幫助時，在什麼情況下我們會說“不”。
2. 爲什麼有些人在該說“不”的時候不說“不”。
3. 該說“不”時不說“不”的壞處。
Don’t Hesitate to Say “No”
In our daily life, there are many occasions on which we should not hesitate to refuse when asked for help. For one thing, when it is beyond our ability, we should give a direct reply “no”. For another, we the thing we are asked for is unreasonable or even illegal, we should say “no” without hesitation.
However, it is not the case in our real life. Many people prefer to say “yes” when they should say “no”. Some are afraid to lose their face, since they think refusal means their inability. Some people are afraid to offend their acquaintances’ face, such as their friends, relatives and so on.
In fact, doing so is quite harmful. If you agree to do the things beyond your ability, the result will only be worse. The other might as well have asked another person who can help. And if you agree to do the unreasonable or even the illegal favors, such as cheating in the exam, you are in fact not helping the other but hurting him. You yourself will get into trouble too.