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A．By May 29th. B．By June 29th. C．By July 29th. D．By April 29th.
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【单选题】Children and Parents Do parents owe their children something? Yes, they owe them a great deal. One of their chief obligations is to give their children a sense of personal worth, for self-esteem is th...
A.
tell the child that other children are doing much better than him/her
B.
remind the child that he/she is not bright
C.
tell the child he/she is just a grass that people won't notice
D.
help the child to build up self-confidence
【简答题】将10g不纯的锌粒（杂质不溶于水也不溶于酸）投入到100g稀硫酸中完全反应，得到了0.2g气体．试计算： （1）锌粒的纯度； （2）参加反应的稀硫酸的质量分数； （3）反应得到的溶液的溶质质量分数； （4）如果我们要用98%的浓硫酸来配制500g反应使用的稀硫酸，需要浓硫酸多少毫升？水多少毫升？（浓硫酸的密度为1.84g/mL）
【简答题】把2.0g硫溶解在40.0g萘中，溶液的凝固点比纯萘低1.28℃，求硫的摩尔质量和分子式。
【简答题】A．have B．possess C．share D．owe
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