[答案]
Arcticfox（北极狐）isakindofsmallfoxthatlivesintheArctic．Itgrowsabout50centimeterslong，notincludingitstail，30centimeterstallandweighsfrom3to7kilos．
TheArcticfoxesarewhiteorblueincolor．Thewhiteonesarewhiteinwinter，butgrey﹣browninsummer．Theblueonesareblue﹣greyallyearround．TheArcticfoxeshavelong，thickhairthatiscalledfur．Andthelongfurcoverstheirwholebodies，includingboththeircateyesandrabbitfeet，tokeepthemwarminthelowtemperatureintheArctic．
TheArcticfoxesfeedmainlyonbirds，birds'eggsandothersmallanimals．Teamworkisthewaytheylookforfood，andtheydon'tliketodothatalone．
BabyArcticfoxesareverylovely．Theydon'topentheireyesuntilaweekaftertheirbirth．Forthefirsthalfoftheyear，theirparentsofferthemfood．Theybegintolookforfoodontheirownwhentheyareaboutsixmonthsold．Thenextyeartheycanlivealone．
Today，thenumberoftheArcticfoxesisbecomingsmallerandsmaller，becausepeoplekillthemfortheirfurtomakebeautifulcoatsformoney．SomethingmustbedonetoprotecttheArcticfoxes．
41．NotalltheArcticfoxeschangetheircolorsindifferentseasons． T
42．TheArcticfoxeshaverabbiteyesandcatfeet． F
43．BabyArcticfoxesarebornwiththeireyesopen． F
44．Birds，birds'eggsandothersmallanimalsarethemainfoodfortheArcticfoxes． T
45．Accordingtothepassage，therearemoreArcticfoxesnow． F ．
[解析]
T细节理解题．根据文章第二段：The Arctic foxes are white or blue in color．The white ones are white in winter，but grey﹣brown in summer．The blue ones are blue﹣grey all year round．可知北极狐是白色或蓝色的颜色． 白色的北极狐在冬天是白色的，但在夏天是灰褐色的． 蓝色的北极狐一年都是蓝灰色的． 所以此题说并不是所有的北极狐在不同的季节会改变它们的颜色是正确的．故答案为T
42．F细节理解题．根据文章第二段：And the long fur covers their whole bodies，including both their cat eyes and rabbit feet，to keep them warm in the low temperature in the Arctic．可知北极狐有猫的眼睛和兔的脚．所以此题答案为：F
43．F细节理解题．根据文章第四段：Baby Arctic foxes are very lovely．They don't open their eyes until a week after their birth．可知北极狐宝宝很可爱，他们是不会睁开眼睛的，直到出生后的一个星期．所以此题不符，故答案为：F
44．T细节理解题．根据文章第三段：The Arctic foxes feed mainly on birds，birds'eggs and other small animals．可知北极狐主要以鸟类为食，还有鸟蛋和其它小动物．所以此题是正确的，故答案为：T
45．F细节理解题．根据文章最后一段：Today，the number of the Arctic foxes is becoming smaller and smaller，because people kill them for their fur to make beautiful coats for money．可知今天，北极狐的数量正变得越来越少，因为人们杀死它们后用皮毛制作漂亮的外套来赚钱．所以此题不符，故答案为：F
[点评]
本题考查了"科普知识类阅读 "，属于"综合题"，熟悉知识点是解题的关键
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