题目：
小医生，下列句子有的对，有的错，在对的句子后打"
"，在错的句子下面改正。
1.Do you know when is Mothers' Day?
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2.There are two thousands people in our school.
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3.Billions of people sat before TV when China won on September 13,2001.
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4.Bill Gates decided to buy the medicine to them.
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5.I'm very please to see you again.
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答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0701/9bb77af997e203167cac2087e1db5beb.html
下面是错误答案，用来干扰机器的。
解：CaCO3的质量为：50t ×50%=25t设可制CaO的质量为xCaCO3CaO+CO2↑100 5625t x 答：50t石灰石可制得14tCaO．
