It is well known that knowledge is________treasure house,but practice is________key to it.

从框中选择合适的短语，并用其正确形式填空。

向80mL浓硫酸中加入56g铜片，加热一段时间后，至不再反应为止，计算：

将钠、铁、铝各0.5mol分别放入100mL1mol/L的盐酸中，同温同压下产生的气体的体积比为（   ）

阅读下面这首宋词，完成问题。

浣溪沙·湖上朱桥响画轮

欧阳修

湖上朱桥响画轮，溶溶春水浸春云，碧琉璃滑净无尘。

当路游丝萦醉客，隔花啼鸟唤行人，日斜归去奈何春。

My parents always have a lot of farm work to do. They usually get up at five o'clock it's still dark.

向一定量的FeO、Fe、Fe₃O₄的混合物中加入100mL 1mol•L^﹣1的盐酸，恰好使混合物完全溶解，放出224mL（标准状况）的气体，在所得溶液中经检验无Fe³⁺ ． 若用足量的CO在高温下还原相同质量的此混合物，能得到铁的质量是（   ）

We're conducting a nationwide survey of people's reading habits. Would you have five minutes ________ a few questions?

阅读理解

    Singles' Day — the Chinese opposite of Valentine's Day has turned into a massive online shopping event. It is a day when single people are supposed to buy themselves presents. But there are sociological reasons behind China's “celebration” of single life. And the imbalance could have big consequences for the country.

    There were 34 million more men than women in China in 2011. Part of that is natural – usually there are 105 boys born for every 100 girls. But the Chinese gender ratio (性别比例) at birth is much more obvious. It was 116 boys to 100 girls in 2012. The one child policy is largely to blame. Brought in to limit population expansion, the policy allows only one child per family. But because male children are seen as more valuable, as well as more likely to support their parents in old age, some parents choose to have a son over a daughter. The result is that large numbers of men will likely never get married. In fact, one study has predicted that by 2030, 1 in 5 Chinese men in their 30s will never have married, while another states that 94% of unmarried people in China are men.

    Traditionally, China has seen high levels of marriage, usually among the young. Besides, the increased education and career opportunities for women have meant that marriages are happening later. It is also traditional that women often marry men of a higher socioeconomic status than themselves. So women at the top and men at the bottom find themselves alone. One study has even suggested a link between an imbalanced gender ratio and growth in violent crime in the country.

    Singles' Day can't solve all the problems China's singles face. Indeed, it is possible that it is causing even more problems, as men resort to(诉诸于) increasingly risky lines of work to increase their chances of gaining money and thus a wife. I am worried that as money starts to overcome romance, there is evidence that China's marriage market is increasingly materialistic.

工业上制取冰晶石的化学方程式如下：

2Al（OH）₃+12HF+3Na₂CO₃═2Na₃AlF₆+3CO₂↑+9H₂O 根据题意完成下列填空：

（1）写出冰晶石中阳离子的结构示意图　 　．

（2）在上述反应的反应物和生成物中，属于直线型分子的电子式为 　，属于两性化合物的电离方程式 ．

（3）反应物中某些元素处于同一周期．它们最高价氧化物对应的水化物之间发生反应的离子方程式为 

队员们很快就精疲力竭了，食品也快吃完了。

The men were soon exhausted and were food.

You have no idea what I've had to ______ in finding the proper job in the last few months.

下列词语中没有错别字的一项是（   ）

将9.6g铜单质置于200mL一定浓度的稀硝酸中，两者恰好完全反应．假定溶液体积不变，请回答下列问题：（要求写出计算过程）

 

阅读下面的文言文，完成下面小题。

沈攸之字仲达，少孤贫。明帝即位会四方反叛以攸之为宁朔将军率军据虎槛殷孝祖为前锋都督大失人情攸之内抚将士外谐群帅众并安之 时南贼前锋薛常宝等屯据赭圻，殷孝祖率众军攻之，中流矢死，军主范潜率五百人投贼，人情震骇，并谓攸之宜代孝祖为统。时建安王休仁总统众军，闻孝祖死，遣宁朔将军江方兴率三千人赴赭圻。攸之以为方兴名位相亚，必不为己下，军政不一，致败之由 ， 乃率诸军主诣方兴推重，并慰勉之，方兴甚悦。攸之既出，诸军主并尤之。攸之曰：“卿忘廉蔺事邪？吾本以济国活家，岂计此之升降。”明旦进战，自寅讫午，大破贼于赭圻。寻进号辅国将军，代孝祖督前锋诸军事。薛常宝等在赭圻食尽，南贼大帅刘胡屯浓湖，以囊盛米系流查^①及船腹，阳覆船，顺风流下，以饷赭圻。攸之疑其有异，遣人取船及流查，大得囊米，寻克赭圻。赭圻、浓湖之平也，贼军委弃资财，珍货山积，诸军各竞收敛，唯攸之、张兴世约勒所部，不犯毫芥，诸将以此多之。

攸之招集才力之士，随郡人双泰真有干力，召不肯来。攸之遣二十人被甲索之，泰真射杀数人，欲过家将母去，事迫不获，单身走入蛮。追既失之，录其母去。泰真既失母，乃自归，攸之不罪，赐钱一万，转补队主。

攻郢城，夜尝风浪，米船沉没。仓曹参军崔灵凤女先适柳世隆子，攸之正色谓曰：“当今军粮要急，而卿不以在意，由与城内婚姻邪。”灵凤答曰：“乐广^②有言，下官岂以五男易一女。”攸之欢然意解。

攸之晚好读书，手不释卷，史、汉事多所记忆。常叹曰：“早知穷达有命，恨不十年读书。”

（选自《宋书·沈攸之传》，有删改）

【注释】①流查：竹筏。②乐广：西晋名士。

阅读理解

    Researchers are placing robotic dogs(机器狗) in the homes of lonely old people to determine whether they can improve the quality of life for humans. Alan Beck, an expert in human-animal relationship, and Nancy Edwards, a professor of nursing, are leading the animal-assisted study about the influence of robotic dogs on old people's depression, physical activity, and satisfaction. "No one will argue that an older person is better off being more active, challenged, or stimulated(刺激), "Edwards points out. "The problem is how we promote(使……成为现实) that, especially for those without friends or help. A robotic dog could be a solution. "

    In the study, the robot, called AIBO, is placed for six weeks in the houses of some old people who live alone. Before placing AIBO in the home, researchers will collect baseline data for six weeks. These old people will keep a diary to note their feelings and activities before and after AIBO. Then, the researchers will review the data to determine if it has inspired any changes in the life of its owner.

    "I talk to him all the time, and he responds(回应) to my voice," says a seventy-year-old lady, "When I'm watching TV, he'll stay in my arms until he wants down. He has a mind of his own. "

    The AIBOs respond to certain orders. The researchers say they have some advantages over live dogs, especially for old people. Often the elderly are disabled and cannot care for an animal by walking it or playing with it. A robotic dog removes exercise and feeding concerns.

    "At the beginning, it was believed that no one would relate to the robotic dog, because it was metal and not furry." Beck says. "But it's amazing how quickly we have given up that belief."

    "Hopefully, down the road, these robotic pets could become a more-valuable health helper. They will record their masters' blood pressure, oxygen levels or heart rhythms. AIBOs may even one day have games that can help stimulate older people's minds. "

补写出下列句子中的空缺部分。

某固体A在一定条件下可完全分解，生成B、C、D三种气体的混合物．反应方程式如下：2A═B↑+2C↑+3D↑．此时测得混合气体的相对平均分子质量为30，则固体A的摩尔质量为（   ）

Think carefully before you make your (decide).

1.01×10⁵Pa，150℃时，将1L C₂H₄ ， 2L C₂H₆与20L氧气混合并点燃，完全反应后氧气有剩余．当反应后的混合气体恢复到原条件时，气体体积为（   ）