题目

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。People are wearing face masks to reduce the risk of infection. It’s a simple but effective method for us to protect【1】(we) from harmful things. In fact, masks have been helping mankind【2】centuries.In the first century, workers in mines used bladder (膀胱) skins to stop dust from being taken in. This idea【3】(consider) the first recorded mask invention then. In 1848, Lewis patented a protective mask for miners, 【4】was a milestone in face mask history. In 1897, Johann desi 用括号中所给词的适当形式填空I'm sorry, I can't read the________ word．(two)