A． Some new factories.
B． Some first-class universities.
C． A multitier transport system.
D． Many trees.

A． The use of beads in Native American monetary systems.
B． Communication over long distances in southeastern canada.
C． Difficulties encountered by native couriers.
D． Alliances between the Iroquois and the Algonquin.

A． Adverse traveling conditions delayed the courier.
B． The courier needed to hire a guide.
C． The fees of several couriers were included in the charge.
D． The letter contained a valuable item.