Population tends to grow at an
exponential(指数的)rate. This means that they progressively double. As an example
of this type of growth rate, take one penny and double every day for one month.
After the first week, you would have only 64 cents, but after the fourth week
you would have over a million dollars.
This helps explain why
the population has come on "all of a sudden". It took from the beginning of
human life to the year 1830 for the population of the earth to reach one
billion. That repents(缓慢进行)a time span of a
A. The penny that doubles itself every day for one month
B. The time span of at least two million years in human history
C. An illustration of the exponent growth rate given by the author
D. The large amount of money you would luckily make after the fourth week
更多"Directions: There are 5 passages in"的相关试题:
[单项选择] Directions: There are 5 passages in this part. Each passage is followed
by six questions or unfinished statements. For each of them there are four
choices marked A, B, C and D. Passage One
It’s not just your imagination. In
cities from coast to coast, the use of Spanish is booming, and is proliferating
in ways no other language has before in the U.S. history--other than English of
course.
It’s this sort of environment that is a cause for
concern for many. Mauro Mujica heads a group called "U. S. English," which
lobbies for official English laws across the country. He’s concerned that with
so many Spanish speakers entering the country, the U.S. will become a nation
split by language, much like Canada.
"Now we’re beginning to
divide ourselves, to split along linguistic lines. We’re beginning to see
pockets of people who s
A. adds color to the muhicultural society
B. poses enough threat to national unity
C. creates more jobs for the immigrants
D. causes trouble with regard to equality
[单项选择] Directions: There are 4 passages in this part. Each of the passages is
followed by 5 questions or unfinished statements. For each of them there are 4
choices marked A, B, C and D.Passage One
On cold days in Delhi, the poor light bonfires (篝火)
of tyres, trees and rags whose fumes mix with the exhaust from the city’s 2
million vehicles to form a thick smog. On most days in Mexico City, a blanket of
pollution cuts off views of the surrounding mountains. On one famous occasion it
got so bad that birds fell dead out of the sky on to the Zocalo, the city’s main
square. Throughout the developing world, smogs in many big cities are getting
worse as more people use cars and more manufacturing firms are belching out (喷出)
pollution. Congestion is on the rise, too: according to one estimate, a car in
Bangkok now spends the equivalent of 40 da
A. lungs
B. eyes
C. bloodstream
D. heart
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