1. [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 resident n.居民→nonresident n.
② residence n.居住→noresidence n.
2. [同義相連]以下是以resid-為詞干的單詞，其基本含義是“剩余”，“殘留”。可借助詞典完成本題。
① resid a.剩余的；殘留的
② residue b.殘留物；社會底層
③ residual c.殘油；渣油
④ residuary d.剩余的；接受剩余財產的
⑤ residuum e.殘余；余數(shù)；剩余財產
3. [尋根問底]指出下列單詞的詞根并領會其詞義的由來。
① obsess v.迷?。焕p住
obsession n.著迷；纏住
② sessile a.固著的；座生的；無柄的
③ subsidy n.助學金；津貼
subsidiary a.輔助的；補助的
subsidize v.給……補助；資助
④ residentiary n. [宗教]駐在牧師；居住者
4. [節(jié)外生枝] sid有個異形根sed來自sidere的異體sedere。以下是主要的派生詞。
① sediment n.沉淀；沉積
sedimentary a.沉淀性的；沉積的
② sedan n.轎子；轎車
③ sedentary a.坐著的；（鳥等）定居的
④ sedate a.安靜的 v.給……服鎮(zhèn)靜藥
sedation n.鎮(zhèn)靜
sedative a.鎮(zhèn)靜的；止痛的 n.鎮(zhèn)靜劑；止痛藥
85. sign [L]=mark記號
常用詞sign，signal，signature和signify中含有一個常用的拉丁詞根sign，它來自拉丁名詞signum或拉丁動詞signare的詞干部分，意思為mark（記號）或to mark（加記號）。
sign [sign=mark, or to mark（加）記號→]Ⅰn.① mark or symbol符號；記號：mathematical signs數(shù)學符號② indication標志，標記：Black is a sign of mourning.黑色是哀悼的標志。③ gesture示意動作：signlanguage手語Ⅱv.① write (one's signature) on簽（名），署（名）：to sign a document簽發(fā)文件② communicate by a sign以動作示意：He signed his disapproval by frowning.他皺眉表示不同意。
▽signable [sign v.;-able a.] a.可簽名的
signless [sign n.;-less a.] a.不表示的；無符號的
signal [sign=to mark記號；-al n.=the result表行為結果→“the result of marking做記號的結果”→]Ⅰn. anything that serves to indicate信號，暗號：traffic signals交通信號→Ⅱa.① serving as a signal用作信號的：a signal light信號燈② unusual;outstanding非凡的；突出的：a signal accomplishment非凡的成就→III v. make a signal to向……發(fā)信號：Sailors signal with flags by day and with lights at night.水手們白天用旗，晚上用燈發(fā)信號。
▽signalize [signal;-ize v.] v.使突出；表明；向……發(fā)信號
signify [sign=mark記號；-ify v.=to make使→“to make something a sign使某物成為標記”→] v.① be a sign of;have the meaning of表明；意味：The clouds signified the coming storm.烏云意味著暴風即將來臨。② be of importance;matter有重要性；要緊：What a fool says does not signify.傻瓜之言，無關緊要。
▽signification [signif(y);-ication n.] n.正確意義；含義
significative [signif(y);-icative a.] a.有意義的；表明……的
signature [sign=to mark加記號；-ature n.=the result表行為結果→“the result of making one's mark on (sheep)在（羊身上）加上自己標記的結果”→] n.① personal mark本人的標記 ② one's name signed on a document署名，簽字：to put one's signature to a letter在信上簽名
▽signatureless [signature;-less a.] a.無署名的
signatory [sign;-atory n./a.] n.簽署者 a.簽署的
assign [as-(ad-)=to 向；sign = to mark 加記號→“to mark something to somebody向著某人對某事作出記號”→] v.① give out;allocate給予；分配：They assigned us a room. 他們分配一個房間給我們。② give out as task指派，布置：to assign homework to the class給班上學生布置作業(yè)
▽assignment [assign;-ment n.] n.（分派的）任務，作業(yè)
assignation [assign;-ation n.] n.分配；分派；指定；約會
consign [con-(com-)= together 共同；sign = to mark 作標記→“to mark together as an agreement 共作標記以示同意”→] v. ① transfer to another's custody把……委托給：to consign the boy to the care of his uncle把男孩托給叔叔照管② hand over or deliver托運，運送：to consign goods to the agents將貨物運給代理商
▽consignment [consign;-ment n.] n.托付（物）；運送（物）
consignee [consign;-ee n.] n.受托人；收貨人；收件人
design [de-=down下；sign=to mark做標記→“to mark down in detail詳細地做下標記”→]Ⅰv.① prepare the plan for設計，構思：to design a new bridge設計新橋 ② develop and plan for a purpose謀劃，預定：The scholarship is designed for foreign students.這項獎學金是為外國留學生設立的。Ⅱn. ① outline or drawing for something to be constructed 設計圖，圖紙：designs for the new building 新樓圖紙② the way in which something is shaped or made設計：to study art and design學習藝術設計
▽designing [design;-ing a.] a.工于心計的；狡猾的
designable [design;-able a.] a.可設計的
resign [re-=undo取消；sign=to mark or seal加標識→“to undo that of sealing, or unseal取消標識或封印”→] v.① give up without resistance放棄，拋棄：He resigned himself to failure.他自甘失敗。② give up an office or position辭職，引退：He resigned his seat in the Parliament.他辭去議院的議席。
▽resignation [resign;-ation n.] n.辭職；放棄
