七选五练习题29_Scientists and experts have proved the uniqueness of fingerprints and discovered that no exactly similar pattern is passed on from parents to children, though nobody knows why this is the case. The ridge(隆起)structure on a persons fingers does not change with growth and is not affected by surface injuries. Burns, cuts and other damage to the outer part of the skin will be replaced in time by a new one, which bears a reproduction of the original pattern. 30._Some crimi
