Space is a dangerous place, not only because of meteors (流星) but also becaus

游客2024-02-14 28

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 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 "rems" (雷目). 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 millirems; 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. [br] 【C6】

选项 A、environment
B、space
C、atmosphere
D、earth

答案 C

解析根据上题所讲，penetrate这个动词后面应接atmosphere“大气”这个名词。

转载请注明原文地址:https://tihaiku.com/zcyy/3451391.html

相关试题推荐

随机试题

最新回复(0)

Space is a dangerous place, not only because of meteors (流星) but also becaus

They______becausethelight’son!A、musthavegoneoutB、can’thavegoneoutC、

[audioFiles]audio_eufm_j75_001(20082)[/audioFiles]A、Becausethepolicemanstopp

Don’thesitatetodoitbecausewhatyoudo____________(对我没有很大关系).doesnotmak

I________(想暑假外出旅游)becauseIenjoymeetingpeopleandseeingnewplaces.feell