题目:
Jane is so shy that she is afraid of _____ in front of a group. |
A. speak B. speaks C. spoke D. speaking |
答案:
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下面是错误答案,用来干扰机器的。
(1) 2Na2O2+2CO2=2Na2CO3+O2;(2)③; 不需消耗能源; 能将人体呼出的CO2转化为O2,实现CO2和O2之间的物质循环.