下列离子方程式中正确的有（） A．稀硫酸滴加在铜片上：Cu+_爱下问搜题

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问题选择题

下列离子方程式中正确的有（　　）

A．稀硫酸滴加在铜片上：Cu+2H⁺=Cu²⁺+H₂↑

B．氧化铁粉末溶于稀盐酸：Fe₂O₃+6H⁺=2Fe³⁺+3H₂O

C．氧化镁与硝酸（aq）反应：O^2-+2H⁺=H₂O

D．硫酸镁（aq）与氢氧化钡（aq）混合：Ba²⁺+SO₄^2-=BaSO₄↓

答案

A．Cu与稀硫酸不反应，则不能写出离子反应，故A错误；

B．氧化铁粉末溶于稀盐酸的离子反应为Fe₂O₃+6H⁺=2Fe³⁺+3H₂O，故B正确；

C．氧化镁与硝酸（aq）反应的离子反应为MgO+2H⁺=H₂O+Mg²⁺，故C错误；

D．硫酸镁（aq）与氢氧化钡（aq）混合的离子反应为Mg²⁺+2OH^-+Ba²⁺+SO₄^2-=BaSO₄↓+Mg（OH）₂↓，故D错误；

故选B．

单项选择题

近年来我国商品房价格快速攀升。2005年第四季度政府各部门出台多项措施，以抑制房价的过快增长，但2006年第一季度全国房价仍逆势上扬。有人断言：地价上涨是房价猛涨的罪魁。以下哪项如果为真，最能对该断言提出质疑( )

A．2006年第一季度上海房价比去年同期增长19.1%，地价上升了6.53%

B．2006年第一季度北京住宅价格比去年同期增长7.2%，住宅用地价格上涨了O.37%

C．华远地产董事长认为，随着土地开发成本的提高，房价一定会增加

D．永泰开发公司董事长认为，房价的暴涨是因为供应量没有跟上需求量

完形填空

阅读下面短文，从短文后所给各题的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
Many parents expect their children to be perfect. By giving up this myth (神话，不可能的事), we may gain something better—the good childhood. Tameka Watkins, ___36__, seems to have a natural skill for___37__. She sits with her ten-year-old ___38___ Cornelious—nicknamed C.D.— each night as he sets about doing his homework, but she doesn’t do it for him. ___39__ he tells her what he is learning, she listens with___40___. An investigation of the National Assessment of Educational Progress found that students like C.D. who __41___ their studies at home have __42__ average reading scores. The opportunity to talk about and to reflect on (思考) what he knows will ___43__ this honor student well through his school years.
While C.D. helps his mother clear the table, they talk about what’s on his__44__. Sometimes it’s his dream of being a police officer. Tameka encourages her son’s “what if” thinking, asks about his idea for the __45__, and ties it to his current (当前的) achievements. “You know, the police __46__solve problems,” she might tell him, “just like you did in ___47__.” And when he visits his mom, who works as an exercise technician, his mother’s liking for her job___48___an example of satisfaction in a self-chosen task.
Takema is___49__ Robert Brooks call “a charismatic (有魅力的) ___50__”, one who helps the child learn about himself. “Children gather ___51___ strength and a resilient (适应能力强的) mind from this loving notice,” he says.
Not overpraised, not __52__ , not constantly rescued—__53___listened to, understood, and supported, C.D. is ___54__ the best possible gift of childhood from his __55___. It is the chance to be himself.

B．in other words

C．for example

D．granddaughter

B．satisfaction

B．science class

C．language class

B．overweighted

D．overprotected