1.A
根据:A meteorite almost hit an 80-year-old man named Arthur Pettifer in Britain when he was working in his garden.
2.D
根据:might be over four thousand million years old
3.B
由文意可以推知.
4.C
根据:About 3,500 meteorites may fall on earth every year,but only very few are found.
5.A
根据:Mr.Pettifer is glad.