1.critical a．挑毛病的(looking for faults)；關鍵的；危急的(of or at a crisis)

詞根記憶：來自critic(n.評論家，批評家；愛挑剔的人)

例:Proponents of IT argued that it takes both time and a critical mass of investment for IT to yield benefrts.

派生詞：critically(ad.危急地；批評性地)

同根詞：hypercritical(a.吹毛求疵的)

2.criticism n．批評( the act of criticizing usually unfavorably);評論(a critical observation or remark)

詞根記憶：來自critic(n.批評家；評論家)

例:The old government was more tolerant of criticism by the press than the new one is．

同根詞：critical(a．批評的；批判的)

3.critique n.評論（文）(a critical estimate or discussion);配批判性她討論(to examine critically)

詞根記憶：crit(評斷)+ique--評論

例:It is a crrtique of a particular women's studies program.// The purpose of the passage is to explain and crftique the methods used by early statisticians.

4.crossbred a．雜種的(hybrid)

例:The crossbred cows can produce, on average, 2,700 liters per year.

5.crucial a．決定性的(decisive)；至關緊要的(significant)

詞根記憶：cruc(十字)+ial--十字關頭的--決定性的

例:It will be crucial that land managers know what statistical measures actually mean.

6.crude a．天然的(natural)；粗糙的，拙劣的(marked by the primitive, gross, or by uncultivated simplicity or vulgarity)

例:crude oil原油//The sanitary conditions were uniformly cruda throughout the country.

7.crusade n.十字軍東征，宗教戰爭（any of the military expeditions undertaken by Christian powers in the 11th, 12th, and 13th centuries to win the Holy Land from the Muslims)

詞根記憶：crus(十字)+ade--原指十字軍東征--宗教戰爭

例:Louis Vll did spend great sums on an unsuccessful crusade.

同根詞：cruciform( n．十字形)；crusader(n．十字軍戰士)

8.crush n.粉碎：壓榨(an act of crushing)；迷戀(an intense and usually passing infatuation);v.擠壓(to squeeze or force by pressure so as to alter or destroy structure)；壓碎(to squeeze together into a mass)

聯想記憶：碰撞( crash)后被碾碎(crush)

例:Both partially biodegradable and non-biodegradable plastic beverage containers can be crushed completely flat by refuse compactors.

9.crust n.外殼（the hardened exterior or surface）；地殼(the outer part of the Earth)

例:In most earthquakes the Earth's crust cracks like porcelain.

派生詞：crustal(a．地殼的)

10.crustal a．殼的；地殼的(of or relating to or characteristic of the crust of the Earth)

詞根記憶：來自crust(n．外殼)

例:Deep events occur in places other than where crustal plates meet.

同根詞：crusty(a．有殼的)