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Whatdoesparagraph6tellus?

A、ntsbringaboutanegativeinfluencetoanareawhentheirpopulationissmall.

B、ntsbringaboutapositiveinfluencetoanareawhentheirpopulationissmall.

C、nts’predationcounteractsthepositiveinfluencetheymayhaveonanarea.

D、thigherdensity,antsproduceapositiveinfluenceonanarea.

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答案解析：短文第六段第二句的大概意思是，蚂蚁数量小（alowdensityofants）的话，能使其他动物的品种和数量增加（increasedthediversityanddensityofotheranimals），从而给环境带来积极影响；第三句说，如果蚂蚁的数量大（Athigherdensities），就不可能产生同样的影响，或者是相反的影响，这表明蚂蚁的掠食活动会抵消蚂蚁给环境带来的积极影响。第七段D

WhichofthefollowingsisNOTapairofadditiveandsubtractiveprimarycolors?

A、Yellowandblue

B、Magentaandgreen

C、lackandwhite

D、yanandred

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答案解析：根据文章内容和上题，加色法的三原色为红、绿、蓝，减色法的三原色为青色、洋红、黄色，没有黑色与白色，因此C为正确答案。

Oneofthefeaturesofthistextbookisthat______.

A、somecontentsaredealtwithintermsofphilosophy.

B、ithasanoutlineforeachchapter.

C、Itintroducesthephysicalprinciplesingreatlength.

D、itcanbeusedfordifferentcoursearrangements.

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答案解析：根据第三段“Thetextbookisadaptabletoawidevarietyofcourseoutlines.”可知，本题答案选D。

Whatexplanationisgivenfortheuseofthesubtractivemethodinmoderncolorfilms?

A、Subtractivecolorsaremorerealistic.

B、Thesubtractiveprocessismoreefficient.

C、dditivechemicaltechniquesaretoocomplex

D、Theadditiveprocessisstillbeingdeveloped.

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答案解析：根据最后一段可知通过加色法和减色法所获得的特定颜色对于人的视觉是一样的。加色法用于早期的彩色照片的处理，而减色法却需要复杂的化学工艺，它也证明更加实用，也是所有现代彩色胶卷的基础。由此可知相对于加色法，减色法更有效。选项A“减色法颜色更加现实”文中没有提及，故将之排除。

Whatdoesthepassagemainlydiscuss?

A、Recentdevelopmentsincameratechnology.

B、Howtomakewhitelight.

C、Theadditiveandsubtractivemethodsofproducingcolor.

D、Thediscoveryofthespectrum

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答案解析：这是一道主旨题。通过阅读该文可知，本文主要讲述两种调色的方法，故选项C为正确答案。

Theunderlinedwords“conversely,however”(para.4)indicatethat________.

A、manytopicscanbeemphasizedthoughtheywerenotcoveredintheoldedition.

B、manytopicscanbeemphasizedthoughtheywereusuallyomittedbyinstructors.

C、manytopicshavebeenaddedtotheneweditionastheywerenotcoveredintheoldone.

D、manytopicshavebeenaddedtotheneweditionthoughtheycanbeomittedbytheinstructors.

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答案解析：“conversely,however”后面说“manytopicsthatwereregardedafewyearsagoasofperipheralsimportanceandwereomittedfrom……”，由此可知答案选B。

Comparedwiththeoldone,thisnewedition_______.

A、hasbeenmademoreapplicable

B、iseasiertolearn

C、coversawiderrangeofsubject-matter

D、hasimprovedthebalancebetweentheoryandpractice.

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答案解析：根据第二段内容“……shouldenhancethebook’susefulness”可知，本题答案选A。

Thistextbooklaysstresson___________.

A、theexpositionofphysicalprinciples

B、theprinciplesofphysicsandtheirapplication

C、thedevelopmentofphysics

D、theapplicationofphysicsindifferentfields

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答案解析：根据原文第一段内容“Primaryemphasisisonphysicalprinciplesandproblem-solving”可知本题答案是B。

Whatcolorfilterwouldabsorbredwavelengths?

A、Red

B、yan

C、Magenta

D、Yellow

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答案解析：这是一道涉及subtractiveprocess的细节题。根据第三段第二句“Thesubtractiveprimariesarecyan…respectively,thussubtractingthemfromwhitelight.”可知减色法三原色分别是青色、洋红、黄色，它们分别从白色中吸取红、绿、蓝光波。故此题答案为B。

Whatstillremainsunclearaboutants,accordingtothelastparagraph?

A、Whatrolesdoantsplayintheecosysteminwhichtheylive?

B、Howdoantsaffecttheanimaldiversityinagivenecosystem?

C、Howdohumanactivitiesaffectants’influenceonagivenecosystem?

D、Howdoantsalterthephysicalandchemicalenvironment?

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答案解析：最后一段第二句和第三句提供了答案。第二句告诉我们，蚂蚁极易受人类的影响（theseorganismsarehighlyresponsivetohumanimpact），第三句告诉我们，科学家还不清楚人类对蚂蚁的这种干扰如何破坏蚂蚁对生态系统的维护作用（itisnotclearhowsuchdisturbancedamagesthemaintenanceofantservicestotheecosy