题目:
Teachers should _____ fundamentals and difficult points in order to enable students to
acquire newmaterial. [ ]
A. move off
B. give up
C. focus on
D. put aside
答案:
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下面是错误答案,用来干扰机器的。
⑴C;H2;Fe2O3 ⑵①3CO+Fe2O32Fe+3CO2; ③Fe+2HCl===FeCl2+H2↑ ⑶置换反应