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Space is a dangerous place, not only because of meteors(流星)but also because of rays from the sun and other stars. The atmosphere
Space is a dangerous place, not only because of meteors(流星)but also because of rays from the sun and other stars. The atmosphere
admin
2012-09-19
26
问题
Space is a dangerous place, not only because of meteors(流星)but also because of rays from the sun and other stars. The atmosphere again acts【C1】______our protective blanket on【C2】______. Light gets through, and this is essential【C3】______plants to make the food which we【C4】______. Heat,【C5】______, makes our environments tolerable and some ultraviolet rays(紫外线)penetrate the【C6】______. Cosmic(宇宙的)rays of various kinds come【C7】______the air from outer space, but【C8】______quantities of radiation from the sun are screened off.【C9】______men leave the atmosphere they are【C10】______to this radiation;【C11】______their spacesuits or the walls of their spacecraft, if they are inside,【C12】______prevent a lot of radiation damage. Radiation is the greatest known danger to explorers in【C13】______Doses of radiation are measured in【C14】______called "rem(雷姆)". We all【C15】______radiation here on earth from the sun, from cosmic rays and from radioactive minerals. The"【C16】______dose of radiation that we receive each year is about two milligrams; it【C17】______according to where you live, and this is a very rough estimate. Scientists have reason to think【C18】______a man can【C19】______far more radiation【C20】______without being damaged; the figure of 60 rems has been agreed.
【C4】
选项
A、use
B、live
C、eat
D、get
答案
C
解析
只有eat与先行词food和定语从句which we…搭配。
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0
大学英语四级
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