At the end of every chapter in our science text, there is a group of______questions, intended for students who wish to go more d

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问题 At the end of every chapter in our science text, there is a group of______questions, intended for students who wish to go more deeply into the subject.

选项 A、optional
B、portative
C、optimistic
D、operational

答案A

解析 optimistic“乐观的”；optional“可选择的”：portative“可搬运的，可携带的”；operational“操作的，运用的”。根据题意，正确答案为A。

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At the end of every chapter in our science text, there is a group of______questions, intended for students who wish to go more d

考博英语

TheStudents’Unionofyouruniversityisplanningtoholdanartsfestivalnextsemester,andtheyareinvitingstudentstocont

WhenaScottishresearchteamstartledtheworldbyrevealingthreemonthsagothatithadclonedanadultsheep,PresidentClin

Theworld’spopulationcontinuestogrow.Therenowareabout4billionofusonearth.Thatcouldreach6billionbytheendof

Theworld’spopulationcontinuestogrow.Therenowareabout4billionofusonearth.Thatcouldreach6billionbytheendof

Thereisnodenyingthatstudentsshouldlearnsomethingabouthowcomputerswork,justasweexpectthematleasttounderstand

Amajorreasonforconflictintheanimalworldisterritory.Themaleanimalestablishesanarea.Thesizeoftheareaissuffi

Itisfutiletodiscussthematterfurther,because_____goingtoagreeuponanythingtoday.

Forthispart,youshouldwriteacompositiononthetopicOnInformationSecurity(信息安全问题).Youshouldwriteatleast200words.

AimlessnesshashardlybeentypicalofthepostwarJapanwhoseproductivityandsocialharmonyaretheenvyoftheUnitedStates

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设f′(x)在区间[0，4]上连续，曲线y=f′(x)与直线x=0，x=4，y=0围成如图所示的三个区域，其面积分别为S1=3，S2=4，S3=2，且f(0)=1，则f(x)在[0，4]上的最大值与最小值分别为()

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