①滴加Mg（NO₃）₂溶液；②过滤；③滴加AgNO₃溶液；④滴加Ba（NO₃）₂溶液．

下列各组词语中划线字的读音全都正确的一项是（   ）

下列关于家庭电路和安全用电说法，其中正确的是

2016年4月，******指出，“一带一路”建设是我国在新的历史条件下实行全方位对外开放的重大举措、推行互利共赢的重要平台，其中的“一带”是指“丝绸之路经济带”，在古代，丝绸之路的说法正确的是（    ）

    A boy lost his arms in an accident and his father lost his life. Since then, he had to1the arms of his younger brother. Except for writing with his toes(脚趾头), he could hardly do  2in his life.
    As the two brothers grew up together, they had lots of 3 and they often argued(争吵). Then one day, his younger brother 4 him. So he was very sad and didn't know 5 to do.
    A girl lost her hands because of a fire. Though her elder sister wanted to 6 her, she decided to be completely independent (独立的). At school, she always studied hard. Once she wrote the following in her composition, “I am 7. Though I lost my hands, I still have legs. Though my wings are broken, my heart can still fly.”
    One day, the boy and the girl were both invited 8 a television interview program. They both were asked to write something on a piece of paper with their toes. The boy wrote “My younger brother's arms are my arms”9 the girl wrote "Broken wings, 10 heart”.