Which ones of the following are correct?()

A、Trans-polyisoprene is more readily packed and crystallizable, and has properties of crystalline polymersB、Cis-polyisoprene is more readily packed and crystallizable, and thus has properties of crystalline polymersC、Trans-polyisoprene is tougher and harder than cis-polyisopreneD、Cis-polyisoprene is tougher and harder than trans-polyisoprene