The project will help people understand the many threats to the natural environment ________ endangered plants and animals live.
A．whichB．whenC．whereD．that
C
C　考查定語從句。句意：該項(xiàng)目將幫助人們理解瀕危植物和動物生活的自然環(huán)境所面臨的許多威脅。分析句子成分可知，空處引導(dǎo)定語從句，且在定語從句中作狀語，先行詞為the natural environment，故用where引導(dǎo)定語從句。
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