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【单选题】
某研究小组为测定食用白醋中醋酸的含量进行了如下操作，其中正确的是 ( )A.
用碱式滴定管量取一定体积的待测白醋放入锥形瓶中
B.
称取4.0 g NaOH加入到1 000 mL容量瓶中，再加水至刻度，配成1.00 mol/L NaOH标准溶液
C.
用NaOH溶液滴定白醋，使用酚酞作指示剂，溶液颜色恰好由无色变为浅红色，且半分钟内不褪色时，为滴定终点
D.
滴定时眼睛要注视着滴定管内NaOH溶液的液面变化，防止滴定过量
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A.
Because she thought he would accept the boy as his own without suspicion.
B.
Because she thought there would always have been a shadow of mistrust between them.
C.
Because the boy was the son of her another lover.
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Because he was very tired of his work and wanted to have a good rest.
B.
Because he had promised to spare more time to stay with his son.
C.
Because he had missed his son and his family for days.
D.
Because he came to realize the importance of the time with his family.
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A.
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B.
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Because of the mood;
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A.
Because he wanted to let the mother remember him.
B.
Because he wanted people to know he was the president.
C.
Because he wanted to show his thanks and kindness to the mother.
D.
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