题目

With many wild animals gradually dying out, the present situation deserves (pay) attention to. 答案：【1】paying/to be paid区别以下各组物质的方法错误的是A.用火焰的颜色区别一氧化碳和氢气B.用肥皂水区别软水和硬水C.用燃着的木条区别氧气和二氧化碳D.用燃烧法区别羊毛和涤纶