WhichofthefollowingisTRUEaccordingtothepassage?
A£®Ninetypercentofallthematterintheuniverseisinvisible.
B£®Darkmattercausesvisiblemattertobehaveinastrangeway.
C£®Galaxiesinaclustersometimesbehaveinanunusualmanner.
D£®invisiblematterkeepsgalaxiestogetherwithgravity.


Inastronomicalterms,acluster_____.
A£®consistsofgalaxies
B£®consistsofgroups
C£®makesupsuperclusters
D£®makesupagroup


Theneareraplanetistothesun,_____.
A£®thelighteritis
B£®thegreatergravityitexerts
C£®theheavieritis
D£®thefasteritorbits


AccordingtoNewton¡¯sprinciple,_____.
A£®theforceofgravitykeepsplanetsorbitingaroundthesunratherthanflyingoff
B£®thesunisthemostmassiveobject,makingup99£®8percentofthemassofthesolarsystem
C£®theamountofmassdeterminehowfasttheobjectstravelastheyorbiteachother
D£®Plutoreceivestheleastforceofgravityfromthesunofalltheplanetsinthesolarsystem
Passage4
Achildwhohasoncebeenpleasedwithatalelikes£¬asarule£¬tohaveitretoldinidenticallythesamewords£¬butthisshouldnotleadparentstotreatprintedfairystoriesassacredtexts.Itisalwaysmuchbettertotellastorythanreaditoutofabook£¬and£¬ifaparentcanproducewhat£¬intheactualcircumstancesofthetimeandtheindividualchild£¬isanimprovementintheprintedtext£¬somuchthebetter.
Achargemadeagainstfairytalesisthattheyharmthechildbyfrighteninghimorarousinghissadistic£¨Å°´ý¿ñµÄ£©impulses.Toprovethelatter£¬onewouldhavetoshowinacontrolledexperimentthatchildrenwhohavereadfairystoriesweremoreoftenguiltyofcrueltythanthosewhohadnot.Aggressive£¬destructive£¬sadisticimpulseseverychildhasand£¬onthewhole£¬theirsymbolicverbaldischargeseemstoberatherasafetyvalvethananincitementtoovertaction.Astofears£¬thereare£¬Ithink£¬wellª²authenticated£¨Êµ¼ÊµÄ£©casesofchildrenbeingdangerouslyterrifiedbysomefairystory.Often£¬however£¬thisarisesfromthechildhavingheardthestoryonce.Familiaritywiththestorybyrepetitionturnsthepainoffearintothepleasureofafearfacedandmastered.
Therearealsopeoplewhoobjecttofairystoriesonthegroundsthattheyarenotobjectivelytrue£¬thatgiants£¬witches£¬twoª²headeddragons£¬magiccarpets£¬etc.£¬donotexist£»andthat£¬insteadofindulginghisfantasiesinfairytales£¬thechildshouldbetaughthowtoarguewiththem.Iftheircaseweresound£¬theworldshouldbefullofmadmenattemptingtoflyfromNewYorktoPhiladelphiaonabroomstick£¨É¨Öã°Ñ£©orcoveringatelephonewithkissesinthebeliefthatitwastheirenchantedgirlª²friend.
Nofairystoryeverclaimedtobeadescriptionoftheexternalworldandnosane£¨½¡È«µÄ£©childhaseverbelievedthatitwas.

Theauthorconsidersthatafairystoryismoreeffectivewhenitis_____.
A£®repeatedwithoutvariation
B£®treatedwithcorrectattitude
C£®adaptedbytheparent
D£®suitedtotheageofthechild


Somepeopledislikefairystoriesbecausetheyfeelthatthey_____.
A£®temptpeopletobecrueltochildren
B£®showtheprimitivecrueltyinchildren
C£®lendthemselvestoundesirableexperimentswithchildren
D£®increasethetendencytobeaggressiveinchildren


Theauthorthinksthatfairystoriesareameansbywhichchildren¡¯simpulsesmaybe_____.
A£®beneficiallychannelled
B£®givenadestructivetendency
C£®heldbackuntilmaturity
D£®effectivelysuppressed


Accordingtotheauthor,fairytales_____inachild.