American Crisis, a series of 16 pamphlets, was written byA．Thomas Paine.B．Theodore Dreiser

Harry Potter is a series of seven fantasy novels.（)

About a quarter of the workers are jobless because of the economic crisis.A.thirdB.fourth

A series of rifle shots disturbed the tranquil

A series of rifle shots disturbed the trangqui

The scientists have conducted a series of exp

The scientists have conducted a series of 【experi