Earth has an atmosphere, which protects the surface from harmful rays.

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问题 Earth has an atmosphere, which protects the surface from harmful rays.

选项 A、minerals
B、substances
C、gases
D、beams

答案D

解析 ray的意思是“光线”。minerals“矿物质”，substances“物质”，gases“气体”，beams“光束”。根据题意，本题答案为D。

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Earth has an atmosphere, which protects the surface from harmful rays.

在职申硕（同等学力）英语

ItistheinteractionAbetweenpeople,Bratherthantheeventsthatoccurintheirlives,thatCarethemainfocusDofsocialps

What’syourearliestchildhoodmemory?Canyourememberlearningtowalk?Ortalk?Thefirsttimeyou【C1】______thunderorwatche

Insteadofansweringthequestion,themanager______hisshouldersasifitwerenotimportant.

Therecentfindingsarealsoapplicabletootherareasofdesignengineering.

Researchersbelieveoneway(tominimizing)(thedamage)istoget(better)at(predicting)theriskoffire.

Everyonehasfacedtheembarrassing______ofdecidinghowmuchextratogiveawaiterortaxi-driver.

Daltonwonderedwhytheheavierandlightergasesintheatmospheredidnotseparateasoilandwaterdo.Hefinallyconcludedt

Thecountryannouncedthatitwouldhaltnucleartestingthisyearandhopedthatothercountrieswouldtakethesameaction.

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