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

admin2010-07-24  31
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.
【C8】
选项 A、strained
B、hided
C、stored
D、put
答案C
解析 动词辨义题。some of the energy that is... in the nuclei of atoms“释放出______ 在原子核中的一些能量”，可推测能量必然是储藏在原子核中的，故选择store“储藏，储存”。strain意为“拉近，过分使用，使劳累”；hide意为“隐藏”，文中只是储存的意思，并不带隐蔽的，秘密的这一感情色彩；put意为“放置”，能量是自然存在于原子核中的，并非人为放置，故可排除。
转载请注明原文地址:https://kaotiyun.com/show/jdN7777K
0

大学英语四级

相关试题推荐
随机试题
最新回复(0)