下列有关化学用语表示正确的是
A．对硝基甲苯的结构简式：
B．镁离子的结构示意图：
C．次氯酸的电子式：
D．亚硫酸钠水解的离子方程式：SO32- +2H2O
H2SO3+2OH-
答案：A
题目分析：A、硝基和甲基处于苯环的对位，正确；B、镁离子第3层电子已失去，错误；C、次氯酸分子O原子分别与H原子和Cl原子形成一对共用电子，错误；D、SO32‾分步水解：SO32‾+H2O
HSO3‾+OH‾，错误。
 YoYo Ma was born in 1955 to Chinese parents living in Paris. He began to study the cello with his father at four. A year later, when he was 36 years old, he gave his first concert. The family soon moved to New York, America. Later he joined Julliard School, a school 37 gifted musicians. He went to Harvard University to study music and graduated in 1976. YoYo soon became famous for his concerts. He always tries to play the cello with music from different countries like Brazil and China. He wrote 38 for the film Crouching Tiger, Hidden Dragon. It sounds brilliant. YoYo is sometimes forgetful. He once 39 his cello in a taxi in New York. He was really 40 because it’s worth US $2,000,000.The taxi driver took it to a police station. YoYo was very thankful.
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