①attest 证明：at（to）+test（测验、考验）→attest（to test sth测验某物→证明）
The child's good health attests to his mother's care.
②attract 吸引：at（to）+tract（拉）→attract（to tract sth or sb→吸引）
The flower show attracted large crowds this year. 17、auto- ：self;personally
①autograph 亲笔：auto（self）+graph（写）→autograph（write sth by oneself自己写… →亲笔）
I've got lots of famous footballers' autographs.
②autoalarm 自动报警器：auto（self）+alarm（警报、报警）→autoalarm(自动报警器）
In fire autoalarm control system the fire detector is the key part for the detecting of fire signals.
火灾自动报警控制系统中,探测器是探测火灾信号的关键部件。
③autobiography 自传：auto（personally）+biography（传记、个人简介）→autobiography（自传）
Iacocca's autobiography is a best-seller.
18、be- ：make or cause to be；加以...,饰以...,用...(做某事)；在；加强及引申意义
①befit 适宜：be（make）+fit（适合）→befit（make sth fit …使某物适合…→适宜）
Such actions do not befit you.
②bepowder 在...上撒粉：（be加以…，饰以...+powder花粉→bepowder给某物加以/饰以花粉→在...上撒粉）
If both orders are opposed the block defect frost may be erased when the bottom is bepowdered.
③becloud 遮蔽：［be用...(做某事)+cloud云→becloud用云遮盖某物即遮蔽］
Remorse took hold of the disciples because they had allowed the prevailing unbelief to leaven their opinions and becloud their understanding. 门徒心中觉得非常痛悔，因为他们让当时社会上流行的不信，影响自己的思想，蒙蔽自己的认识。
④beside 在...旁：（be在+side旁边→beside在…旁边） I set a chair beside him and sat down.
⑤bespatter 溅污：be（表加强意义）+spatter溅，洒落→bespatter 溅污 All speeches made to bespatter me in the trial will be punished. 凡是在审判中诋毁我的言论都将被定罪！ 19、bene- ：well;good
①benevolent 乐善好施的：bene［（well；good）+vol（wish,will,表示\意志,意愿\）+ent→benevolent好的意志/意愿→乐善好施的］
The original designers of the human body were benevolent beings. 人类身体的最初设计者是仁慈的生命体。
②benediction 祝福：bene［（well；good）+dict（say/assert,表示\说话,断言,写\）+ion名词后缀→benediction说好话→祝福］ I say the benediction to my father's birthday.
③benefaction 恩惠，善行：bene［（well；good）+fact（do,make 表示\做,制作\）+ion名词后缀→benefaction做好事→恩惠、善行］ I will repay your benefaction one day. 20、bi- ：two
①bicycle 自行车：bi（two）+cycle（自行车）→bicycle（自行车） Can you ride a bicycle?
②bilateral 双方：bi（two）+lateral（侧向； 外侧 ）→bilateral有两个外侧的即双方
Nothing emerged from the bilateral talks. 双边会谈没有结果。 ③bicolor 双色的：bi（two）+color（颜色）→bicolor有两种颜色的即双色的
a bicolor postage stamp双色邮票
21、by- ：旁、侧、非正式、副
①byroad 小路，僻径：by（旁、侧）+road（路）→byroad（大路旁边的路即小路）
Xiaoming likes to go back home on the byroad.
②bywork 业余工作：by（非正式、副）+work（工作）→bywork（非正式的工作即业余工作）
To releave the economic burden in the family his wife finds a bywork. ③byname 别名，绰号：by（非正式、副）+name（名字）→byname（非正式的名字、副名即别名）
His classmates would like to call his byname rather than his real name after this case. 22、circu- ：around
①circumnavigate 环球航行：circu（around）+navigate（航行）→circumnavigate（navigate around the world环绕着世界航行即环球航行） Magellan was the first person to circumnavigate the globe. 麦哲伦是第一个环球航行的人。
②circumspect 考虑周到的：circu［（around）+spect（look/see,表示\看\）→circumspect环顾四周即考虑周到的］
He was very circumspect in his financial affairs. 他对于自己的财务十分细心。
③circumpolar 在两极周围的：circu（around）+polar（极地的，两极的）→circumpolar（around the polar环绕两级的即在两级周围的） It's commonly considered a single circumpolar species. 这一般被认为是极地地区单一的品种。 23、co- ：together
①co-action 共同行动：co（together）+action（行动）→co-action（do sth. together一起做某事即一起行动、共同行动）
It was co-action of government，society and people for China’s recovery from economic crisis.）
②cooperate 合作：co（together）+operate（操作；经营、管理）→cooperate（operate sth. together共同管理某事即合作） I am so happy to cooperate with you.
③coeducation 男女同校：co（together）+education（教育）→coeducation（男女在一起接受教育即男女同校）
Coeducation is very common in North America. 24、col- ：together
①collaboration 协作，勾结：col（together）+labor（劳动、工作）+ation（名词后缀）→collaboration（do labor together一起劳动/工作即协作） He wrote the book in collaboration with his colleagues.
②collingual 用同一种语言的：col（together）+lingual（语言的）→collingual（use one language together即用同一种语言的）
United Nations and United Kindom are two collingual countries. ③collocate 并置，并列：col（together）+locate（查找…的地点；确定…的位置 ）→collocate（locate two things together使两个事物坐落在一起即并置、并列）
These two words don't collocate. 这两个词搭配不当。 25、com- ：together；加强或引伸意义
①compatriot 同胞、同国人：com（together）+patriot（爱国者，爱国主义者）→compatriot（在一起的爱国者即同胞）
He believes that he and his compatriot student are the future leaders. 他相信他和他同国的学生是未来的领袖。
②commove 使动乱：com（表加强意义）+move（移动）→commove使动乱 His vibrant voice commove the air. 他响亮的声音振动了空气。 ③commemorate 纪念：com（表引申意义）+memor（memory,表示\记忆\）+ate（v.后缀）→commemorate（记住某人或某事即纪念) A monument was built to commemorate the victory. 26、con- ：together；加强或引伸意义
①concolorous 同色的：con（together）+color（颜色）+ous（adj.后缀）→concolorous颜色一样的即同色的
It is monotonous to paint the rooms with concolorous painting. ②confirm 使坚定：con（表示加强）+firm（表示\坚定\）→confirm（使坚定） His letter confirmed everything. 27、contra- ：against
①contradiction 矛盾：contra（against）+dict（say/assert,表示\说话,断言,写\）+ion（1. 表示\某种物,用品;人等\表名词,\动作或状态等\）→contradiction与…对着干即矛盾
The contradictions are becoming increasingly acute.矛盾日益尖锐. ②controversial 可能引起争议的：contra（against）+oversial→controversial 可能引起争议的
More controversially, he claims that these higher profits cover the cost of finding fresh talent.
更具争议的是，他声称这些更高的利润可足以支付寻找新人才所花费的成本。 ③contraclockwise 逆时针方向的：contra（against）+clock（钟）+wise［（1、用于名词后构成副词）表示“关于”，“在…方面”；（用于名词后构成副词）表示“像…一样”，“如同”］→contraclockwise向时钟相反的方向转动即逆时针方向的
Turn the key contraclockwise/in an contraclockwise direction.逆时针方向转动钥匙
28、cor- ：together；加强或引伸意义
①correlation 相互关系：cor（together）+relation（关系）→correlation(relate two things together两件事关联在一起即相互关系） Are you familiar with their correlation ?
②correct 改正，纠正：cor（表加强意义）+rect（straight/right,表示\正,直\）→correct（make sth. rect使某物正确即改正、纠正） Your answer to the question is correct.