（ C ）1.Have you ever seen an elephant?
（ E ）2.Is the Sun a star?
( A ) 3.Light travels faster than sound .
( D ) 4.How many planets go around the Sun?
( B ) 5.Who have been to the Moon?
（ C ）1.Have you ever seen an elephant?
（ E ）2.Is the Sun a star?
( A ) 3.Light travels faster than sound .
( D ) 4.How many planets go around the Sun?
( B ) 5.Who have been to the Moon?