单选题
More than a century ago, the relationship between glacial
ice and the amount of water in the ocean basins was first seen. When the great
ice sheet covered vast land areas, the sea level was lowered because the normal
return of water from land to the ocean was reduced. As a result, the sea level
rose as Ice Age glaciers melted allowing the melted waters to flow into the
ocean. If all the glacial ice on the surface of the earth today should melt, the
sea level might rise by more than 150 feet. Shoreline variations are also
produced through elevation or depression of the land. During times of glacier
formations the great weight of the ice slowly depressed the earth's crust.
Removal of the weight through glacier melting allowed the slow return of the
crust to its former position. Changes in the Great Ice climates from cool and
wet to warm and dry produced climate changes far from the glaciated are A. For
example, at times of cool-wet glacial climates, levels of inland lakes rose, in
contrast to the depression of sea level. During the warm-dry interglacial
climates, lake levels were lowered. The ancient lake Bonneville, largest of the
glacial lakes in Western United States, once covered more than 20,000 square
miles. It had a maximum depth of more than 1,000 feet. Great Salt Lake in Utah
is the shrunken remnant of this once large lake. Although the
first time that early man walked on the earth is uncertain, he is largely a
product of the Great Ice Age. Present information shows that during this time he
evolved rapidly both physically and culturally. His most primitive tools and
skeletal remains have been found in some of the oldest deposits contemporary
with the Great Ice Age in Africa, Asia and Europe. These are often associated
with remains of extinct animals. With the disappearance of the great ice sheets,
the Bronze and Iron Age cultures evolved. About this time many animals suited to
cooler climates died. Although much remains to be learned, the
story of the Great Ice Age is being unfolded through the efforts of specialists
in many fields. Recording field observation, new theories and methods, and
worldwide studies of existing glaciers are bringing a clearer understanding of
the Great Ice Age.
单选题
Which of the following is NOT implied in the passage?
A.Man has a lot more to learn about the Great Ice Age.
B.The art of making tools was instrumental in bringing about the evolution
of human brain.
C.Many species were not suited to the warmer climates of the Bronze and Iron
Age.
D.The relationship between glacial ice and the amount of water in the ocean
basins was not seen until more than a hundred years ago.
【正确答案】
B
【答案解析】[解析] 工具的制造对人脑的进化起到了至关重要的作用，这一点并未在文中提到。
单选题
According to the article，which of the following will induce the
depression of sea level?
A.formation of great masses of ice sheet on the land.