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Rescuers are ______ for the safety of the two men trapped in the mine.

A．gratefulB．concernedC．extremeD．frightened

B

解析試題分析：句意：營救人員為困在井下的兩個(gè)人的安全擔(dān)心。be concerned for/about 為……擔(dān)心憂慮；be grateful to sb for sth 因某事而感謝某人；extreme極度的；frightened恐懼的。根據(jù)句意，可知選B。
考點(diǎn)：考查詞義辨析。

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