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文件名称:下半年英语四级模拟题及答案仔细阅读.docx
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下半年英语四级模拟题及答案:仔细阅读

GrowingnumbersofscientiststhereforeseeAntarcticaasadistant-early-warningsensor,wherepotentiallydangerousglobaltrendsmaybespottedbeforetheyshowuptothenorth.Onepromisingfieldofinvestigationisglaciology.ScholarsfromtheUnitedStates,Switzerland,an