{{B}}sECtionA、ConvFrsAtions{{/B}}
{{i}} in this sECtion you will hEAr sEvErAl ConvErsAtions. listEn to thE ConvErsAtions CArEFully AnD thEn AnswEr thE quEstions’ thAt Follow.{{/i}}

{{i}} quEstions 1 to 4 ArE BAsED on thE Following ConvErsAtion.At thE EnD oF thE ConvErsAtion, you will BE givEn 20 sEConDs to AnswEr thE quEstions. now listEn to thE ConvErsAtion.{{/i}}

whAt is thE ConvErsAtion mAinly ABoutA．thE possiBlE ExistEnCE oF liFE on othEr plAnEts.
B．mEthoDs For BuilDing powErFul nEw tElEsCopEs.
C、A、tEChniCAl proBlEm thAt AstronomErs CAn’t solvE.
D．thE DisCovEry oF plAnEts orBiting DistAnt stArs.