An A is worth four points, a B three points, a C two points and a D one point.

VOA: special.2009.03.05

The team examined results from a Norwegian study of nine hundred fifty-four people with C.O.P.D.

VOA: special.2009.06.03

The C.D.C.also found that carbon monoxide kills more than four hundred Americans each year.

VOA: special.2010.02.02

In nineteen eighty-four, the John F.Kennedy Center for the Performing Arts in Washington,D.C.

VOA: special.2009.11.29

In fact, it was not until nineteen sixty-four that D.C.

VOA: special.2009.03.20