选择合适的字填空。 块 匹 畦 首 座 片 (1)一( )稻田 (2)一( )马 (

使用叉车时，如有大型货物挡住驾驶员视线时，应继续前进。

某铜矿石含氧化铜、氧化亚铜、三氧化二铁和大量脉石（SiO₂）,现采用酸浸法从矿石中提取铜，其流程图如下

已知： 

①当矿石中三氧化二铁含量太低时，可用硫酸和硫酸铁的混合液浸出铜；

②反萃取后的水层是硫酸铜溶液，Cu²⁺浓度约为50g/L。

回答下列问题：

（1）矿石用稀硫酸浸出过程中氧化亚铜发生的反应为：Cu₂O+2H⁺==Cu²⁺+Cu+H₂O；请写出该过程中发生的另一个氧化还原反应的离子方程式：______________________。

（2）写出用惰性电极电解水层的电解总反应方程式：_________________________。

（3）循环中反萃取剂B的主要成分是___________________。

（4）某铜矿石样品中，若仅含氧化亚铜、三氧化二铁和脉石三种物质。取该矿石样品200.0g，用100mL1.0mol/LH₂SO₄溶液浸取后，还需加入10mL 1.0mol/L Fe₂(SO₄)₃溶液才能使铜全部浸出，浸取液经充分电解后可得到 6.4gCu。求铜矿石样品中氧化亚铜和氧化铁的质量分数？

全国运动会举行女子5 000米比赛，辽宁、山东、河北各派了三名运动员参加。比赛前，四名体育爱好者在一起预测比赛结果。甲说：“辽宁队训练就是有一套，这次的前三名非他们莫属。”乙说：“今年与去年可不同了，金银铜牌辽宁队顶多拿一块。”丙说：“据我估计，山东队或者河北队会拿牌的。”丁说：“第一名如果不是辽宁队的，就该是山东队的了。”比赛结束后，发现以上四人只有一人言中。以下哪项最可能是该项比赛的结果

A．第一名辽宁队，第二名辽宁队，第三名辽宁队。

B．第一名辽宁队，第二名河北队，第三名山东队。

C．第一名山东队，第二名辽宁队，第三名河北队。

D．第一名河北队，第二名辽宁队，第三名辽宁队。

真空精炼只对（）等反应产生较为明显的影响。

A.脱气

B.碳脱氧

C.脱碳

D.脱气、碳脱氧、脱碳

The fridge is considered a necessity. It has been so since the 1960s when packaged food first appeared with the label: "store in the refrigerator. "

In my fridgeless fifties childhood, I was fed well and healthy. The milkman came daily, the grocer, the butcher, the baker, and the ice cream man delivered two or three times a week. The Sunday meat would last until Wednesday and surplus bread and milk became all kinds of cakes. Nothing was wasted, and we were never troubled by rotten food. Thirty years on, food deliveries have ceased, fresh vegetables are almost unobtainable in the country.

The invention of the fridge contributed comparatively little to the art of food preservation. A vast way of well tried techniques already existed—natural cooling, drying, smoking, salting, sugaring, bottling…

What refrigeration did promote was marketing—marketing hardware and electricity, marketing soft drinks, marketing dead bodies of animals around the globe in search of a good price.

Consequently, most of the world’s fridges are to be found, not in the tropics where they might prove useful, but in the wealthy countries with mild temperatures where they are climatically almost unnecessary. Every winter, millions of fridges hum away continuously, and at vast expense, busily maintaining an artificially cooled space inside an artificially heated house—while outside, nature provides the desired temperature free of charge.

The fridge’s effect upon the environment has been evident, while its contribution to human happiness has been insignificant. If you don’t believe me, try it yourself, invest in a food cabinet and turn off your fridge next winter. You may miss the hamburgers, but at least you’ll get rid of that terrible hum.

Which of the following phrases in the fifth paragraph indicates the fridge’s negative effect on the environment().

A．Hum away continuously

B．Climatically almost unnecessary

C．Artificially cooled space

D．With mild temperatures