1 . We have difficulty in_____ (explore) the wild. (所给词的适当形式填空)
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2 . The scientists are____________ (探索) all possible ways to improve a life of high quality. (根据汉语提示单词拼写)
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3 . Every possibility for the treatment of AIDS is being ________ (探索).(根据汉语提示单词拼写)
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4 . The scientists are trying to e ________ the unknown and mysterious sea world.(根据首字母单词拼写)
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