PP test-2 第三篇 Q29 (reading) (已收錄)

[wufaery09]

請問29題答案為什麼是A呢?看了半天實在不知道文章中哪裡有說明?請各位高手指點一下吧!謝謝

29. It is significant that food bones and
tools in Olduvai were abandoned
where they were dropped
because they

A.provide accurate information
about the people who
used them
B.have been preserved and sold
to collectors of artifacts
C.are buried under huge quantities
of earth
D.have been changed dramatically
by the forces of nature



Much of our knowledge of the earliest hunters and
gatherers is found by excavating abandoned living
sites. These groups of people favored lakeside
camps or convenient rock overhangs for protection
from predators and the weather, for availability of
abundant water, and for access to herds of game
and vegetable foods. Olduvai Gorge in Tanzania is
renowned for its prehistoric sites, which include small
lakeside locations used by early humans for a few
days or weeks before they moved on in their constant
search for game, vegetable foods, and fish.
Fortunately for archaeologists, the early hunters
and gatherers abandoned food bones and tools where
they dropped them. In Olduvai, the gently rising waters
of a prehistoric lake slowly covered the bone caches
and preserved them for posterity, with the tools lying
where they had fallen. Other ancient people lived by
the banks of large rivers. Their tools are
found in profusion in the gravel of riverbeds that were
subsequently jumbled and re-sorted by floodwater,
leaving a confused mass of artifacts, rather
than undisturbed floors of former dwellings for
archaeologists to uncover.
Caves that were occupied more than half a million
years ago were reoccupied again and again as
people returned to the locations they preferred. Many
natural caves and rock shelters contain deep deposits
of artifacts, called “occupation layers,” that can be
removed by meticulous excavation with a dental pick,
trowel, and brush. The sequence of occupation layers
can be uncovered almost undisturbed from the day of
abandonment.
In contrast to the archaeological evidence left
by hunters and gatherers, sites left by farmers were
generally larger because farmers were tied to their
herds and gardens and moved less often. Higher
population densities and more lasting settlements
left more conspicuous archaeological sites from later
millennia of human history. In many areas, farming
sites were occupied time after time over several
thousand years, forming deep mounds of refuse,
house foundations, and other debris from human
habitation. These sites, known as “tells,” require
large excavations and extensive earthmoving if
anything is to be understood about how towns and
settlements were laid out.