Eta Carinae　　As possibly the galaxys most massive star, Eta Carinae is now engaging in some very unusual behaviour. Australian astronomers, being in the Southern Hemisphere , are able to observe it clearly.　　While it is not unusual for stars to vary in brightness, the period is usually much shorter. Since 1992 it has become four times brighter, and then last year it began to drop dramatically, he said.　　Eta Carinae is of particular interest to astronomers because it seems to be in its death throes. Being so large it will end up as a supernova . There has not been a supernova in our galaxy since the invention of the telescope. While a 1987 explosion in a nearby galaxy gave astronomers plenty of valuable data, they are hungry for an even closer look.　　31. Eta Carinae is now engaging in　　C. some very frightening behaviour. D. some very strange behaviour　　A. over which star vary in brightness　　C. Eta carinae takes to become a supernova.　　33. Eta Carinae is hard to observe because　　C. the binoculars are not powerful enough.D. it does not send out infrared light.　　A. it is in its final stage. B. it is a supernova.　　35. Which of the following statements about Eta Carinae is NOT true?　　B. It can be seen only through binoculars.　　D. Its ultraviolet laser is brighter than that of the Sun.