1. [舉一反三]根據(jù)已知單詞的詞義推斷出其同根詞的詞義。
digest v.消化→① digestive a.
→② indigestible a.
→③ indigestion n.
2. [由此及彼]根據(jù)已知單詞的詞義推斷出其同根詞的詞義。
① prearrange v.預先安排→predigest v.
② congest v.充血→congestive a.
3. [尋根問底]指出下列單詞的詞根并領會其詞義的由來。
① ingesta n.被攝取的營養(yǎng)物
② gesticulate v.做手勢；用姿勢示意
gesticulation n.做手勢；示意的動作或姿勢
③ congeries n.聚集；堆積
④ gerund n. [語法]動名詞
gerundial a. [語法]動名詞的
41. gnos, gnit, gniz [L, GK]=to know知
詞根 gnos 來自拉丁動詞 gnoscere，意為 to know（知），它與noscere是同一個拉丁詞，只是添加前綴時前面加上g，（這個g在詞根中不讀音，在前綴之后才讀音。）gnit是gnoscere的分詞詞干，gniz是gnit在英語中的變體。
diagnose [dia-=through 通過；gnos=to know 知道；-e→“to know through inquiry通過查詢知道”→] v. identify a disease after examining the patient診斷：The doctor diagnosed the illnesss as influenza.醫(yī)生診斷該病為流行性感冒。
▽diagnosis [diagnos(e);-is n.] n.診斷（法）；診斷結論
cognition [co-=completely完全；gnit=to know知；-ion n.=the act表行為→“the act of knowing completely 全知的行為”→] n. knowing;perception認識（能力）：cognition theory認識理論
▽cognitive [co-;gnit;-ive a.] a.認識的；認識能力的
recognition [re-=again再；cognition=knowing知道→] n.① knowing again認出，識別：She gave no sign of recognition of me.她根本沒有表示認識我。② admission承認：We insisted on recognition of our rights.我們堅持要求承認我們的權利。
▽recognitive [re-;co-;gnit;-ive a.] a.認識的；承認的
recognize [re-=again再；co-=completely完全；gniz=to know知道；-e→] v.① know again認出：The boy recognized the word.男孩認出了那個字。② admit承認：His qualifications are recognized in China.他的資格在中國得到承認。
▽recognizable [recogniz(e);-able a.] a.可以認出的；可承認的
recognizee [recogniz(e);-ee n.] n. [律]被保人
recognizor [recogniz(e);-or n.] n. [律]擔保人，具保證書人
agnostic [a-=not不；gnos=to know知；-tic a.=of……的→“of not knowing不知道的”→] a. of the beliefs that nothing can be known不可知論的：He is agnostic about any phenomenon.他對任何現(xiàn)象都持不可知的態(tài)度。
▽agnostically [（agnostic;-al a.）-ly ad.] ad.持不可知態(tài)度地
incognito [in-=not不；co-=completely完全；gnit=to know知；-o a.=-ing ……的→“not being known 不為人知的”→] Ⅰ a. with one's name hidden隱姓埋名的：to travel incognito匿名旅行 Ⅱ n. person who is incognito隱姓埋名者：to preserve one's incognito保持隱姓埋名的身份
precognition [pre-=beforehand 事先；cognition n. 認識→] n. previous cognition or knowledge預知，早知：He claims the laboratory proof of his precognition.他聲稱他的預言已獲實驗證明。
▽precognitive [pre-;cognitive a.] a.預知的，早知的
prognosis [pro-=forward向前；gnosis=knowing知→“knowing of forward conditions知道前景”→] n. estimate of what will probably happen預測：The prognosis on finance is poor.財政預測的前景不佳。
▽prognostic [pro-;gnos;-tic a./n.] a.預兆的 n.預兆；預測
