We have to admit that the biggest___________ facing the ecosystem is limited resources and the worsening environment.
A．missionB．challengeC．scaleD．contribution
B

試題分析：考查名詞辨析A任務(wù)B挑戰(zhàn)C刻度D貢獻(xiàn) 題意為 我們不得不承認(rèn)面對生態(tài)最大的挑戰(zhàn)是有限的資源與糟糕的環(huán)境。在admit 的賓語從句中 the biggest changllege 是句子的主語，謂語是is ,表語是 limited resources and the worsening environment，分析清句子結(jié)構(gòu)，很容易能得出答案B項。
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