题目内容
根据括号中的汉语写出单词,使句子意思完整正确.
Scientists are working hard to find out a way to cure this special disease caused by an unknown ________(病毒).
答案:virus
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题目内容
根据括号中的汉语写出单词,使句子意思完整正确.
Scientists are working hard to find out a way to cure this special disease caused by an unknown ________(病毒).