Mark the letter A, B, C or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following sentences.Đoạn văn39/40Mark the letter A, B, C or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following sentences. To breed endangered species in the nature reserve, conservation biologists need to carefully observe their habitats.threatenrescuemonitorreleaseGiải thíchC