将1.52g铜镁合金完全溶解于50mL 密度为1.40 g/mL、质量分数为63%的浓硝酸中，得到NO₂和N₂O₄的混合气体1120 mL（换算为标准状况体积），向反应后的溶液中加入1.0 mol/L NaOH溶液，当金属离子全部沉淀时，得到2.54 g沉淀。下列说法正确的是（   ）

将质量均为m g的O₂、X、Y气体分别充入相同容积的密闭容器中，压强(p)与温度(T)的关系如图所示，则X、Y气体可能分别是(   )

A travel b (小册子)contains much information about many famous scenic spots..

阅读下面这首词，完成下题。

水调头·把酒对斜日

【宋】杨炎正^①

把酒对斜日，无语问西风。胭脂何事，都做颜色染芙蓉。放眼暮江千顷，中有离愁万斛，无处落征鸿。天在阑干角，人倚醉醒中。

千万里，江南北，浙西东。吾生如寄，尚想三径菊花丛^②。谁是中州豪杰，借我五湖舟楫，去作钓鱼翁。故国且回首，此意莫匆匆。

【注】①杨炎正:力主抗金的志士。②三径菊花丛:陶渊明《归去来兮辞》中有“三径就荒，松菊犹存”

—Why has the meat gone bad so quickly?

—Because it has been (暴露) to the sun for a long time.

阅读理解

Liu Xiang Will Resume Training

    Athens Olympic 110m hurdle champion Liu Xiang felt so relieved to return to racetrack after getting out of the great number of social activities.

    Liu arrived in hometown Shanghai Wednesday night and was about to resume① training shortly after.

    "I am so exhausted② from so many social activities, which made me even more tired than training," said the 21-year-old Liu, who wrote a new chapter in China's Olympic history by winning the country's first ever athletics short-distance running title in the men's 110m hurdles in Athens in August.

    "I am happy that I will resume my training soon back in Shanghai," said the Shanghai native. He turned into an instant national hero with the Olympic glory③ and one of the most popular Olympic gold medalists, taking part in scores of celebration activities since he returned to China early September.

    "My regular training has been interrupted for such a long time that I think I can only run at about 13.5 seconds now," said Liu, who clocked a world record-tying time of 12.91 to clinch the title.

    "I would rather forget what I have achieved in the past and try my best to realize a higher goal," he said.

    Liu already missed the Berlin Golden League Series on Sunday and won't be able to catch the IAAF Grand Prix final slated for September 18-19 in Monaco.

He plans on attending an IAAF all-star tournament in Japan at the end of this month.

    Choose the best answers according to the above:

物质的量是高中化学常用的物理量，请完成以下有关计算：

设N_A表示阿伏加德罗常数的值，下列说法正确的是（   ）

I like reading books about ________ story of Sang Lan who has ________ positive attitude towards life.

化合物Z由如下反应得到: ,Z的结构简式不可能是（   ）

已知点 和点 ，且满足 ，若点P与点Q始终关于 轴对称，则行列式 的值为.

以下化学用语正确的是（）

I study hard in order  know more about the world.

下列加点的成语使用不正确的一项是（   ）

下列四种模型仅由C、H、O三种原子组成，下列说法正确的是（　　）

​

His hand shook slightly as he i the key into the lock.

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    Reducing the amount of sleep affects students' performance at school. An American study asked schoolteachers to look at the effects of sleep restriction（限制） on children between six and twelve years of age. The teachers found that children who stayed up late had trouble thinking clearly and had more learning problems.

    Doctor Fallone now works at the Forest Institute of Professional Psychology in Springfield, Missouri. He presented the results last month at a science reporter conference in Washington, D. C. The Publication Sleep also reported the findings.

    The teachers were asked to complete weekly performance reports on seventy-four schoolchildren. The study lasted three weeks. During that period, Doctor Fallone and his team controlled the amount of sleep the children received.

    During another week, every child was kept awake later than normal. Each night, the youngest boys and girls had less than eight hours of sleep. The older ones were limited to six and a half hours. During the final week of the study, each child received no less than ten hours of sleep a night.

    The teachers were not told about how much sleep the students received. The study found that students who received eight hours or less had the most difficulty remembering old information.

    The study did not find that sleep restriction caused hyperactivity(极度活跃) in the children.

    Doctor Fall one said that the results provided experts and parents with a clear message:

A. The sleeping time that the students have can be changed easily. B. They also had trouble learning new information, completing difficult work and following directions. C. During one week, the children went to bed and awoke at their usual time. D. The teacher should restrict the amount of sleep of the students. E. Gahan Fallone did the study at the Brown Medical School and Bradley Hospital in the state of Rhode Island. F. The teachers reported that students were, in fact, a little less active at school when they got less sleep. G. When a child has learning problems, the issue of sleep must be considered among the possible causes.

The disease spread (遍及) the country, getting most people into a panic.

同温同压下，相同体积的Cl₂和NO₂气体，具有相同的（　　）

同温同压下，由N₂O和CO₂组成的混合气体的密度是C₂H₄、N₂和H₂组成的混合气体密度的 2倍，则C₂H₄、N₂和H₂组成的混合气体中H₂的质量分数为（   ）