ASTRONOMERS DO NOT KNOW HOW M A NY GALAXIES T H...

857. - De thi trac nghiem TOEIC tong hop
De thi trac nghiem TOEIC tong hop
857. Astronomers do not know how m a ny galaxies t h er e ar e , but it is thought that t h er e is mil l i ons or A B C Dp er h a ps b illi on s .