The cause of the disease is stillunknown．The scientists will put more effort into it．题目和参考答案——青夏教育精英家教网——

题目内容

13．The cause of the disease is stillunknown（未知的）．The scientists will put more effort into it．

分析引起这种疾病的原因还是未知的，科学家们会为此投入更多的精力．

解答答案：unknown．
根据提示汉语结合语境推测句意是"引起这种疾病的原因还是未知的，科学家们会投入更多的精力．"，由设空处前面的系动词is判断设空处应填形容词，提示词"未知的"是unknown，所以答案是：unknown

点评做这类题型，首先根据所给汉语明确句子所要考查的单词或短语的拼写，再结合相关语法知识对单词或短语做出形式上的变化．

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