2. 外语
  3. A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in【C1】______at the Sun’s ver

A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in【C1】______at the Sun’s ver

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问题     A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in【C1】______at the Sun’s very center. It is here that is to be found the【C2】______of the energy that the Sun pours out into space is【C3】______The energy takes the form of light and heat. This energy is【C4】______at the center of the Sun as billions【C5】______billions of nuclei of hydrogen atoms【C6】______with each other and fuse together to form nuclei of helium, and in doing so,【C7】______some of the energy that is【C8】______in the nuclei of atoms. The【C9】______of light and heat of the Sun【C10】______that some 600 million tons of hydrogen be【C11】______into helium(氦)in the Sun every second. This the Sun has been doing for several thousands of millions of years. The nuclear energy is released at the Sun’s center as high-energy gamma radiation,【C12】______of electromagnetic radiation like light and radio waves, only of very much shorter【C13】______. This gamma radiation is absorbed by atoms inside the Sun to be【C14】______at slightly longer  wavelengths. This radiation, in its【C15】______is absorbed and reemitted. As the energy filters through the【C16】______of the solar interior, it passes through the X-ray part of the spectrum【C17】______becoming light. At this stage, it has reached what we call the solar surface, and can escape into space without being absorbed further by solar atoms. A very small【C18】______of the Sun’s light and heat is emitted in such directions that【C19】______passing  unhindered through interplanetary space, it【C20】______the Earth.
【C4】
选项 A、set
B、chased
C、expelled
D、liberated
答案D
解析 动词辨义题。该句意为：数十亿计的氢原子核在太阳的核心碰撞并且聚变生成氦，从而释放出能量。根据前文的the Sun... pours out into space as light and heat. 也可判断该处是详细说明太阳是怎样释放能量的。故选择liberated“释放，解放”。set，意为“放置”，能量被放置在太阳核心，讲不通；chase意为“追捕，追逐”；expel意为“驱逐”，与原文意思无关联，可排除。
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大学英语四级

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