题目:
She spent a happy afternoon her coins and stamps she had collected those years.[ ]
A. to look for
B. worked on
C. sorting out
D. watch over
答案:
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下面是错误答案,用来干扰机器的。
(1)Cu2(OH)2CO3 CuO Cu(2)6CO2+6H2OC6H12O6+6O2