唐代诗人________创作了名句“黑云压城城欲摧，甲光向日金鳞开。”
Nowadaysthe___________fortravellingisshiftedfromshoppingtofoodandscenery.
Insectpestsareamongtheleadingcausesofcropfailure.
DoubleEagleinthefirsttransatlanticballoon,wasgreetedbyavidcrowdsinFrance.
TheSalkvaccineisamajorfactorinthefighttoeradicatepolio.
