Anoctopusismadeupofacentralmassandeightradiatingarms．Suctioncupsonthearmsgivetheoctopusafirmgrip．Inthemassthereisaparrot-likebeak．Thereisalsoasiphon,whichsquirtswaterforjetpropulsionwhenthecreatureisinahurry．Becauseitsbloodcontainscopperinsteadofironasoursdoes,theoctopus'sbloodisblue,notred．Inmostspeciestheskin,ormantle,isthick,tough,andmuscular．
Octopusesvaryinsizefromafewinchestoseveralfeet．Theyrangeinhabitatfromsurfacewaterstodepthsoftwotothreemiles．Someshallowwateroctopusesprotectthemselvesbychangingcolor．Thereareabout150knownspecies．Otherspeciesmayyetbediscovered．
1．Paragraph1givesdetailsabouttheoctopus's___________．
A．lifespanB．sizeC．generalfeaturesD．habitat
2．Becausetheirbloodcontainscopper,octopuseshave_______．
A．thickbloodB．bluebloodC．athinskinD．amuscularskin
3．Theauthorsuggestsourbloodisredbecauseitcontains________．
A．ironB．copperC．mineralsaltsD．carbondioxide
4．Octopuseshave________．
A．eightarmsB．acentralmassC．aparrot-likebeakD．Alloftheabove
5．Afeaturenotcommontoalloctopusesistheabilityto________．
A．movebyjetpropulsionB．changecolor
C．gripbysuckercupD．Alloftheabove
6．Theauthordoesnottellus________．
A．whichspeciesinhabitdeepwaterB．howmanyknownspeciesthereare
C．howthecreaturesrangeinsizeD．whenthecreaturesusejetpropulsion
7．Theauthorstatesthatwe_________．
A．knoweverythingaboutoctopusesB．enjoyeatingoctopuses
C．maydiscovernewspeciesD．thinkoctopusesareugly
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