下列说法中不正确的是（） A．吸热反应不一定需要加热条件 B．放热反应只有化学键

做匀变速直线运动的质点，它在第2秒末的速度为5m/s，在第3秒末的速度为7m/s，求：

（1）它的加速度为多少？

（2）它的初速度为多少？

（3）它在第4秒内的位移为多少？

在西方的音乐传统中，对情感的表达一直被认为是音乐的基本要素和终极使命。可是在其他文化中，比如非洲，音乐的作用是在部落仪式中协调众人的行动，并不强调情感色彩。然而，根据德国马克思·普朗克研究所大脑认知专家托马斯·弗里茨最新公布的对喀麦隆玛法部落的研究结果，虽然此前从未听到过西方音乐，但处于另一音乐体系中的玛法人却可以敏锐识别出西方音乐中表达的喜悦、悲伤和恐惧，与那些自幼接受古典音乐熏陶的西方听众并无差别。研究者指出，音乐或许与面部表情类似，不分种族，不分地域，均可引发共鸣，而这也可以解释为什么源自西方的音乐可以在不同的国度中都能获得成功。
这段文字意在说明( )。

A．对情感的表达是音乐的基本要素和终极使命
B．音乐在各地其表达情感的方式是不同
C．音乐是无国界的
D．音乐的作用是协调众人的行动

B

Daban town is famous for girls and windmills（风车）, while Loulan is a myth（神话）in the desert. From Daban, we move to another ancient city, Loulan.

Two thousand years ago, beside the beautiful and rich Luobu Lake, there lay Loulan, ancient city on the Silk Road. Businessmen from every country gathered here and there were dancing parties. Everything shows that people in Loulan lived a rich life then.

However, two thousand years later, this rich land suddenly disappeared from the map of China. Then it became an area covered with sand and dead tree trunks.

Loulan was first “discovered” by a Swedish man Sven Hedin in 1900. People from America, Britain, Japan and Sweden, all set foot here. Then in the 1930s, a Chinese named Huang Wenbi came to Loulan for the first time. He visited and studied this area and found many relics that were beautifully and carefully made.

It is recorded that the ancient city of Loulan was the capital of Loulan Kingdom during the Han and Jin dynasties. In the past century many things have been dug out there including Han Dynasty coins, mirrors and many others from Greece and Rome. All these things show that a lot of business between East and West once took place there.

Lying on the northwest of the Lop Nur area, the Loulan Kingdom is now a lifeless area with endless “forests” of mounds（小丘）which aren’t easily seen in other parts of the world. Its mystery (神秘) has been attracting so many people from so many countries.

65. The first person to set foot in Loulan in the 20th century is       .

A. a European                 B. an American

C. an Englishman              D. a Japanese

66. Before Loulan disappeared,          .

A. a lot of business between East and West had taken place there

B. people from America and Japan had set foot there

C. a lifeless area with lots of mounds could easily be seen there

D. Africans had visited the ancient country

67. We can infer from the passage that       .

A. Loulan was destroyed by the terrible weather there

B. wars between dynasties made Loulan disappear

C. foreigners came to Loulan and destroyed it

D. how Loulan disappeared is still unknown to us

68. What makes so many people visit Loulan Kingdom?

A. The beautiful scenery there.

B. Its developed business in the past.

C. Its mysterious stories

D. Those buried treasures there

鲜花保鲜同时可以在水中放一些酸性物质，如（）。

A.烟酸

B.硼酸

C.柠檬酸

D.乙酸

赵某是甲房地产经纪公司（以下简称甲公司）的房地产经纪人协理，李某是甲公司注册房地产纪人。赵某经过努力使甲公司取得了乙房地产开发公司（以下简称乙公司）开发的住宅楼的销售代理权，并签订了销售委托合同。该住宅楼于2013年4月1日通过竣工验收，5月2日陈某购买了该住宅楼的一套现房，签订了商品房买卖合同。6月1日乙公司将陈某所购房屋交给陈某使用之后；乙公司按规定给陈某办理了房屋权属登记。陈某在拿到《房屋所有权证》后，发现其上记载的楼层有误。

房屋权属登记信息可以公开查询的信息有（）。

A.原始登记凭证

B.房屋坐落

C.司法查封情况

D.他项权利设定时间