Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the
correct answer to each of the questions from 21 to 30.
We are descendants of the ice age. Periods of glaciation have spanned the whole of human
existence for the past 2 million years. The rapid melting of the continental glaciers at the end of the last
ice age spurred one of the most dramatic climate changes in the history of the planet. During this inter-
glacial time, people were caught up in a cataclysm of human accomplishment, including the development
of agriculture and animal husbandry. Over the past few thousand years, the Earth’s climate has been
extraordinarily beneficial, and humans have prospered exceedingly well under a benign atmosphere.
Ice ages have dramatically affected life on Earth almost from the very beginning. It is even
possible that life itself significantly changed the climate. All living organisms pull carbon dioxide out of
the atmosphere and eventually store it in sedimentary rocks within the Earth’s crust. If too much carbon
dioxide is lost, too much heat escapes out into the atmosphere. This can cause the Earth to cool enough
for glacial ice to spread across the land.
In general the reduction of the level of carbon dioxide in the atmosphere has been equalized by the
input of carbon dioxide from such events as volcanic eruptions. Man, however, is upsetting the equation
by burning fossil fuels and destroying tropical rain forests, both of which release stored carbon dioxide.
This energizes the greenhouse effect and causes the Earth to warm. If the warming is significant enough,
the polar ice caps eventually melt.
The polar ice caps drive the atmospheric and oceanic circulation systems. Should the ice caps melt,
warm tropical waters could circle the globe and make this a very warm, inhospitable planet.
Over the past century, the global sea level has apparently risen upwards of 6 inches, mainly
because of the melting of glacial ice. If present warming trends continue, the seas could rise as much as 6
feet by the next century. This could flood coastal cities and fertile river deltas, where half the human
population lives. Delicate wetlands, where many marine species breed, also would be reclaimed by the
sea. In addition, more frequent and severe storms would batter coastal areas, adding to the disaster of the
higher seas.
The continued melting of the great ice sheets in polar regions could cause massive amounts of ice
to crash into the ocean. This would further raise the sea level and release more ice, which could more than
double the area of sea ice and increase correspondingly the amount of sunlight reflected back into space.
The cycle would then be complete as this could cause global temperatures to drop enough to initiate another
ice age.
Trả lời cho các câu 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 dưới đây:
Đáp án đúng là: A
Đáp án cần chọn là: A
Đáp án đúng là: D
Đáp án cần chọn là: D
Đáp án đúng là: C
Đáp án cần chọn là: C
Đáp án đúng là: D
Đáp án cần chọn là: D
Đáp án đúng là: B
Đáp án cần chọn là: B
Đáp án đúng là: B
Đáp án cần chọn là: B
Đáp án đúng là: C
Đáp án cần chọn là: C
Đáp án đúng là: A
Đáp án cần chọn là: A
Đáp án đúng là: B
Đáp án cần chọn là: B
Đáp án đúng là: A
Đáp án cần chọn là: A
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