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Our planet is like a bit spaceship. Our atmosphere acts【51】a shield against harmful radiation and space debris.【52】holds the air
Our planet is like a bit spaceship. Our atmosphere acts【51】a shield against harmful radiation and space debris.【52】holds the air
admin
2012-02-27
31
问题
Our planet is like a bit spaceship. Our atmosphere acts【51】a shield against harmful radiation and space debris.【52】holds the air and people on the spaceship,【53】everything doesn’t float away. Each of us is an astronaut and our spaceship, the earth, provides our food and water. The sun is our energy【54】and without it we would not be able to survive.
【55】every spaceship, the earth is a closed system. The only thing we receive from the outside is energy from the sun. Everything else must be used【56】again. We astronauts don’t seem to realize that this spaceship is the【57】one we’ve got. We【58】its resources and waste the energy the plants have stored from the sun. If we【59】our spaceship, we will destroy ourselves as well. Maybe if we look at the universe which surrounds us, we will appreciate our own spaceship more and take【60】care of it.
选项
A、source
B、resource
C、origin
D、supply
答案
A
解析
人们使用的太阳能来自太阳,太阳是能量的来源,故应选用energy source这一搭配。resource意为“资源”;origin意为“起源”;supply意为“供应”,如可以说The sun affords us a seemingly endless supply of energy. 所以A选项是正确答案。
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