A summary of the physical and chemical nature of life must begin, not on the

游客2023-07-24 23

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. [br] 【C1】

选项 A、nature
B、fact
C、research
D、addition

答案 B

解析固定搭配题。文章首句说明：概说生命的物理和化学特性一定要始于太阳，而不是地球。而第二句作为补充，意在说明“更确切地说，是始于太阳的核心”。in fact固定搭配意为“其实，实际上”，符合题意，因此B为答案。in nature意为“本质上”；in research意为“在研究中”；in addition意为“另外，加之”。虽然三个词均可与in搭配构成词组，但与句意不符，故排除。

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