请教GWD 19-5

 By the sixteenth century, the Incas

         of South America ruled an empire that

         extended along the Pacific coast and

Line  Andean highlands from what is now

  (5)  Ecuador to central Chile.  While most

of the Incas were self-sufficient

agriculturists, the inhabitants of the

highland basins above 9,000 feet were

constrained by the kinds of crops they

 (10)  could cultivate.  Whereas 95 percent

of the principal Andean food crops can

be cultivated below 3,000 feet, only

20 percent reproduce readily above

9,000 feet.  Given this unequal

 (15)  resource distribution, highland Incas

needed access to the products of

lower, warmer climatic zones in order

to enlarge the variety and quantity of

their foodstuffs.  In most of the prein-

 (20)  dustrial world, the problem of different

resource distribution was resolved by

long-distance trade networks over

         which the end consumer exercised

         little control.  Although the peoples

 (25)  of the Andean highlands participated

in such networks, they relied primarily

on the maintenance of autonomous

production forces in as many eco-

logical zones as possible.  The

 (30)  commodities produced in these

zones were extracted, processed,

and transported entirely by members

of a single group.

      This strategy of direct access

 (35)  to a maximum number of ecological

zones by a single group is called

vertical economy.  Even today,

one can see Andean communities

maintaining use rights simultaneously

(40)         to pasturelands above 12,000 feet, to

potato fields in basins over 9,000 feet,

        and to plots of warm-land crops in

regions below 6,000 feet.  This

strategy has two principal variations.

 (45)  The first is “compressed verticality,”

in which a single village resides in

a location that permits easy access

to closely located ecological zones.

Different crop zones or pasturelands

 (50)  are located within a few days walk of

the parent community.  Community

members may reside temporarily

in one of the lower zones to manage

the extraction of products unavailable

 (55)  in the homeland.  In the second varia-

tion, called the “vertical archipelago,”

the village exploits resources in widely

dispersed locations, constituting a

series of independent production

 (60)  “islands.”  In certain pre-Columbian

Inca societies, groups were sent from

the home territory to establish perma-

nent satellite communities or colonies

in distant tropical forests or coastal

 (65)  locations.  There the colonists grew

crops and extracted products for their

own use and for transshipment back

to their high-altitude compatriots.

In contrast to the compressed

 (70)  verticality system, in this system,

commodities rather than people

circulated through the archipelago.

Q5:

According to the passage, the inhabitants of the Andean highlands resolved the problem of unequal resource distribution primarily in which of the following ways?

1. Following self-sufficient agricultural practices

2. Increasing commodity production from the ecological zones in the highland basins

3. Increasing their reliance on long-distance trade networks

4. Establishing satellite communities throughout the Andean highlands

5. Establishing production forces in ecological zones beyond their parent communities

正确答案选A，请问E错在何处？