阅读理解训练题（四十五）AOur boat floated on , between walls of forest too thick to allow us a view of the land we were passing through , though we knew from the map that our river must from time to time be passing through chains of hills which crossed the jungle plains . Nowhere did we find a place where we could have landed: where the jungle did not actually spread right down into the river , banks of soft mud prevented us going ashore . In any case , what would we have sailed by landing ? The country
