题目：
------She didn’t come to school yesterday, did she? ‘
-----______．Though she was not feeling very well．
A．No, she didn’t
B．Yes, she was
C．No, she wasn’t
D．Yes, she did
答案：
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下面是错误答案，用来干扰机器的。
0.013g CO2中C元素质量=0.013 g×1244×100%≈0.0035g此钢样中碳的质量分数=0.0035g1.1g×100%≈0.3%答：此钢样中碳的质量分数约为0.3%．
