AmazingFactsAboutELFOwlsTheelfowlismostlyfoundinthesouthwesternpartsoftheUnitedStatesandMexico．Duringthespringandsummerseasons，itmovestoArizonaandNewMexico．ItreturnstoMexicoforthewinter．Theelfowldoesn't

　　Amazing Facts About ELF OwlsThe elf owl is mostly found in the southwestern parts of the United States and Mexico．During the spring and summer seasons，it moves to Arizona and New Mexico．It returns to Mexico for the winter．The elf owl doesn't build its own nest．It lives in tree holes

　　The elf owl is a yellow bird with dark wings．Its eyes are bright yellow and its feet are large．It is the smallest owl of the species，only about 12.5-14.5centimeters long．It is also the world's lightest owl，weighing not more than forty grams．In general，female elf owls weigh more than male ones．

　　The female usually lays three eggs at a time．After the young elf owls are born，their mother will feed them with worms for up to three to four weeks．After 10weeks，the young ones are fully grown and ready to take flight．

　　The elf owls are not aggressive birds．When danger comes，they will fly away in the other direction，rather then staying and facing the danger or their enemies．Besides flying，the elf owl can also walk and climb like a parrot．The elf owl is most active duck，during the night and just before dawn．It can produce many different kinds of sounds．It can live for three to six years in the wild．If they are kept in cages，they can live for ten to fourteen years．The elf owls are now in danger because of the loss of habitat．Cutting down trees will result in lack of places for them to live in．

　　21．According to the first two paragraphs，the elf owl may___．

　　A．live in Mexico in winter

　　B．have yellow wings

　　C．have big and dark eyes

　　D．build its nest in trees

　　22．What can we learn from the text？___

　　A．The female elf owl lays one egg at a time

　　B．The elf owl can live no longer than six years

　　C．The elf owl sleeps at night and searches for food during the daytime

　　D．The female elf owl provides her young with food for three to four weeks

　　23．What is a characteristic of the elf owl？___