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问题 选择题

小燕同学在学习笔记中总结了如下规律：

①生活中利用过滤方法降低水的硬度；

②干冰和二氧化碳的化学式都是CO2；

③含有氧元素的化合物都是氧化物；

④单质中元素的化合价都等于零．

其中错误的是（　　）

A．①②

B．①③

C．③④

D．②④

答案

①硬水是指含有较多可溶性钙镁化合物的水，使用过滤的方法不能除去可溶性钙镁化合物，故不能降低水的硬度，故错误；

②干冰是固体二氧化碳，其化学式都是CO2，故正确；

③氧化物是指由两种元素组成且其中一种是氧元素的化合物，并非所有含有氧元素的化合物都是氧化物，故错误；

④在单质中元素的化合价为零，故正确；

观察选项，故选B．

单项选择题

膀胱残余尿测定时，以下哪一种说法不对()

A．残余尿测量应排尿后立即测定

B．膀胱顶部易受肠气掩盖，可适当加压推开肠气，加以纠正

C．测量膀胱各径线时，纵切和横切的加压程度相同

D．测残余尿时应嘱病人多饮水，使膀胱过度充盈后，其排尿后测量残尿更准确

E．超声测定残尿量同膀胱剩余尿量间有一定的误差
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单项选择题

One day a rich woman lost her purse with a lot of money in it. So she made a (1) , "If anybody finds my purse and (2) it to me, I’ll give half the money to him."A poor man (3) the purse near a shop. He sent it back to the woman, but the rich woman (4) . "There was an expensive ring in my purse besides money," said the woman, "I won’t give you half the money in my purse until you return it to me." "But I’ve never seen an expensive ring in (5) purse," said the man.They began to quarrel. The man became (6) and took her to a judge. (7) the judge heard what had happened to them, he said to the woman, "I’m sure that you have lost a purse, and there is an expensive ring in it. But there is (8) a lot of money in this purse. So I don’t think it’s yours. (9) some time. Maybe somebody will give your purse back."Then the judge (10) to the man and said, "Take the purse home. If the owner doesn’t come to get it back in two days, it will be yours.

第（5）空应选择（）

A．your

B．her

C．his

D．my
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