1. The ship Titanic had been given the extra name of "unsinkable" because its ____ was the best there was.

　　A.manufacture B.production C.erection D.construction

　　2. The US dollar is traditionally the ____ of choice all over the world in case of crisis.

　　A.money B.currency C.bill D.cash

　　3. The education provides them ____ to economic progress.

　　A.admission B.acceptance C.approach D.access

　　4. Japan has ____ its steps toward putting into effect an international treaty banning chemical weapons.

　　A.hurried B.bustled C.accelerated D.rushed

　　5. The motion of ocean water ____ at different depths below the surface.

　　A.varies B.modifies C.alters D.differs

　　6. Health experts ____ leisurely meals.

　　A.introduce B.recommend C.present D.comment