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去年,14岁的陈平上初三了。刚开学,他对新开设的化学课非常感兴趣。开学不久的一次化学课上,老师演示了各种物质在氧气里燃烧的化学反应实验。同
Last year, 14-year-old Chen Ping on the third day. After school, he was very interested in the new chemistry class. A chemical class soon after school, the teacher demonstrated a variety of chemical reactions in oxygen burning test. with