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In terms of the evolution of life on Earth, human beings have just arrived. (1) their short time on Earth, however, people have brought about enormous changes to the surfaces of the planet—changes far out of (2) to the interval of time they have (3) it.
With the (4) of intelligence and manual skill, people have found ways to use plant and animal resources, mineral ores, fuels, and so on. As the number of people on Earth increases, it becomes increasingly difficult for the population to survive (5) the resources of the land. The amount of land is limited. Although agricultural production can be promoted by use of (6) such as tractors and the addition of fertilizer, the land (7) can produce only so much food and no more. As human population grows, people (8) more.
People are only a very small (9) of all the living things on the planet. Yet their numbers create a (10) on resources that can’t be (11). For example, the amount of water on Earth is limited; this water is (12) through natural processes. However, the natural processes for (13) can clean only a certain amount of water. (14), a limited number of petroleum can be found under the Earth’s surface.
All natural systems tend toward (15) among opposing factors or forces. Human activities can cause or (16) permanent changes in natural systems. The (17) smoke from thousands of factories has caused enormous air pollution. Cleaning this smoke has exceeded the protective ability of natural processes. The forests cannot clean the air fast enough. The twentieth century began with powerful countries competing to take (18) of the Earth. (19) an outcome of their hunger, the Earth was abused. Now that people are no longer (20) of the causes of the sickness of our planet, they seek ways to rescue the Earth.

问题1选项
A.For
B.Despite
C.In
D.Owing to
问题2选项
A.control
B.step
C.date
D.proportion
问题3选项
A.established
B.occupied
C.damaged
D.influenced
问题4选项
A.cooperation
B.commission
C.combination
D.competition
问题5选项
A.on
B.by
C.with
D.of
问题6选项
A.mechanics
B.mechanism
C.machinery
D.manufacture
问题7选项
A.ultimately
B.previously
C.currently
D.thereby
问题8选项
A.produce
B.consume
C.distribute
D.design
问题9选项
A.friction
B.freight
C.frame
D.fraction
问题10选项
A.drift
B.drip
C.drain
D.drill
问题11选项
A.repaired
B.renewed
C.repelled
D.repeated
问题12选项
A.produced
B.circulated
C.cleaned
D.reduced
问题13选项
A.filtering
B.filling
C.fulfilling
D.figuring
问题14选项
A.Conversely
B.Likewise
C.Nevertheless
D.Therefore
问题15选项
A.future
B.extreme
C.limit
D.balance
问题16选项
A.accelerate
B.induce
C.eliminate
D.facilitate
问题17选项
A.individual
B.subsequent
C.deliberate
D.collective
问题18选项
A.care
B.advantage
C.account
D.charge
问题19选项
A.To
B.In
C.As
D.In spite of
问题20选项
A.tolerant
B.aware
C.ignorant
D.resistant
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