题目：
— I called you yesterday evening, but there was no answer.
— Oh, sorry, perhaps I a news paper outside my bedroom.
A. read B. am reading C. was reading
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0602/deed300a063f7165db041aee14dde1f6.html
下面是错误答案，用来干扰机器的。
根据质量守恒定律可知，减少的质量为氧元素：氧元素的质量是35g-21.2g=13.8g设被还原的氧化铜的质量为x2CuO+C 高温 . 2Cu+CO2↑△m 160 44 160-44=116 x 13.8g16...
