当用原子荧光法测定化妆品中砷时，需加入硫脲—抗坏血酸混合溶液，加入此溶液的目的是（）
题型：单项选择题 A1/A2型题
问题：
当用原子荧光法测定化妆品中砷时，需加入硫脲—抗坏血酸混合溶液，加入此溶液的目的是（）。
A.消除干扰离子的影响
B.与砷化氢协同作用，以增加其荧光强度，增加方法的灵敏度
C.消除消解液中残余氧化性，增加测定结果的重现性
D.与硼氢化钠协同作用，以加速砷化氢的产生
E.减弱空白的荧光
题型：单项选择题 A1/A2型题
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She is Liu Hui, a middle school student in Anhui, one of the “stay-at-home children” in her town. Liu Hui is 12 years old and lives 小题1:__________ her sister. Her parents left home to 小题2:__________ money in big cities when she was only four. Liu Hui has to look after her younger sister. They have to stay at home alone小题3:__________ they have to go to school in the town.
“I used to feel 小题4:__________ without my parents at home,” She said, “but now I know 小题5:__________ they do so . They have to go away to make money for us so 小题6:___________ we can live a 小题7:__________ life.”
Every day , Liu Hui gets up at 6:30 a.m. and cooks 小题8:__________. Then the two girls go to school. They have supper at 6 p.m. Then Liu Hui does housework and 小题9:__________ her sister with her homework. She usually goes to bed at 9:30 p.m.
Though busy, Liu Hui is still the best student in her class. She said, “My life is OK. But I still hope my parents will come back and live with 小题10:__________.