Polar explorers have to be extremely _____ to bear the climate and other hardships.
A．toughB．roughC．difficultD．brave
A
考查形容詞辨析。句意“極地探險家應(yīng)該極其堅強(qiáng)，以承受極端的氣候和其它困難�！盇“堅強(qiáng)的，不屈不撓的”；B“粗糙的”；C“困難的”；D“勇敢的”。故選A。
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