已知某气体的摩尔质量为M，一定条件下的摩尔体积为V_m ， 下列说法正确的是（　　）

阅读下面这首宋诗，完成下面小题。

游月陂^[注]

（宋）程颢

月陂堤上四徘徊，北有中天百尺台。

万物己随秋气改，一樽聊为晚凉开。

水心云影闲相照，林下泉声静自来。

世事无端何足计，但逢佳节约重陪。

（注）月陂（bēi）：水泊名。因形如月，故名月陂，遗址在今洛阳洛水之南。

After two (十年) of hard work, he finally succeeded in his business.

假设你是李华，想成为英国某培训机构的一名教汉语的志愿者。请你根据以下内容用英语写一封申请信。

1）成为志愿者能介绍中国的文化;

2）自己的优势。

注意:1）词数100左右;

2）可适当增加细节，以使行文连贯;

3）开头和结尾已给出，不计入总词数。

Dear Sir or Madam,

    As we know ,a growing number of countries hope to know more about China.……

    Look forward to your early reply.

Yours sincerely,

Li Hua

语法填空。阅读下面材料，在空白处填入适当的内容或括号内单词的正确形式。(每空所填的词最多不超过3个)

    Now, please allow me to (introduce) Lhasa to you. Lhasa is capital city of Tibet, which is (locate) in the Southeast of Tibet. It is a city with a history of more than 1300 years. It is famous for the Potola Palace. Besides, it's also an (attract) city, attracting tens of millions of visitors from home and abroad each year. There are many (place) of interest and people  are very (friend). With the (develop) of modern transportation, traveling becomes (easy). It takes only 2 hours to fly Chengdu to Lhasa. If you have a chance to come to Tibet, welcome Lhasa.

下列关于有机化合物的表示方法中不正确的是(　　)

The writer, k to us students, will finish his third book next month, which many fans are looking forward to.

You should be (感谢的)to have me to look after you.

It must be (强调) that this disease is very rare.

阅读理解

    Have you ever wondered when dogs first became “man's best friend” and the world's favourite pet? If you have then you're not alone. When and where dogs first began living side-side with humans are questions that have stirred hot debate among scientists. There are a few hard facts that all agree on. These include that dogs were once wolves and they were the first animal to be domesticated(驯养) by humans. They came into lives some 15000 years ago, before the dawn of agriculture.

    Beyond that, there is little agreement. The earliest bones found that are unquestionable dogs and not wolves date from 14,000 years ago. However, 30,000-year-old skulls have been discovered in France and Belgium that are not pure wolf and some scientists think could be dogs.

    With such puzzling evidence, many scientists are now turning to DNA to find out when and where dogs were first domesticated. In one research project, tens of thousands of blood samples have been taken from street dogs around the world. The plan is to compare them with those of wolves. It's even possible to analyse DNA from ancient bones. Tiny pieces of the 30,000-year-old skulls mentioned earlier are currently being studied, and another DNA study has already shown that ancient dogs preserved in the Alaskan ice-fields evolved from Asian wolves, not American ones.

    Indeed, the ancient DNA may turn out to be more informative than the DNA of living dogs. Because dogs have accompanied humans around the world for thousands of years, their current distribution may tell us very little of their origins. This is why different groups of scientists believe that dogs variously originated in eastern Asia, Mongolia, Siberia, Europe or Africa.

    But why were the animals domesticated in the first place? The most recent theory is that dogs domesticated themselves, initially living in and around our ancient villages to eat any food thrown out. Today, this is a way of life still shared by three -quarters of a billion unowned dogs worldwide.

将一定质量Fe₂O₃和Al₂O₃的混合固体溶解在200mL 0.1mol·L^-1的过量H₂SO₄溶液中,然后向其中加入NaOH溶液使Fe³⁺、Al³⁺刚好完全沉淀,用去NaOH溶液100 mL,则NaOH溶液的浓度为（   ）

下列表达方式正确的是（   ）

下列说法中正确的是（  ）

在一定温度和压强下，10体积气体A₂跟30体积气体B₂化合生成20体积某气体C，则该气体C的化学式为（用A、B表示）．

写出画线部分的汉语意思。

    Last Sunday, he went to the bakery   and bought some bread. Then he went to buy a pair of sneakers  . When he returned home, he turned on the TV to watch some commercials  about nutrition . Having eaten up the bread, he felt uncomfortable. He had to send for  a doctor. The doctor told him that the bread had gone bad.

某烷烃的相对分子质量为86，与氯气反应生成的一氯代物只有两种，其结构简式是（　　）

下列说法正确的是（   ）

双酚基丙烷(BPA，分子式为C₁₅H₁₆O₂)可能降低男性及女性的生育能力。下列有关判断错误的是（   ）

下列各项中的修辞手法表述有误的一项是（    ）

等体积的两容器内，一个盛一氧化二氮，另一个盛氮气和氧气的混合气体，若容器内温度、压强相同，则两容器内所盛气体一定具有相同的(   )