常温下甲酸（HCOOH ）是一种无色、有刺激性气味的液体，与浓硫酸混合加热的反应

请把下面排列错乱的句子整理成一段通顺的话。

（　　）扬扬觉得自己是个大孩子了，这样的事完全应付得了。 

（　　）忽然他听到敲门声，便不假思索地问：“谁呀？”

（　　）爸爸妈妈上班去了，扬扬独自在家。 

（　　）扬扬爽快地回答：“不在家，有事情晚上来吧？”

（　　）外面的人说：“是我。你家有大人在吗？”

足太阳膀胱经循行“挟脊抵腰中，入循膂”，“膂”是指（）。

A.臀部肌肉群

B.肩部肌肉群

C.股部肌肉群

D.上臂肌肉群

E.脊柱两旁的肌肉群

下图是周期表中短周期的一部分，W、X、Y三种元素原子核外电子数之和等于X的质量数，X原子核内质子数和中子数相等。下列叙述中不正确的是(　　)

A．三种元素的原子半径的大小顺序是W<Y<X

B．W最高价氧化物对应水化物具有强碱性，气态氢化物的水溶液具有弱酸性

C．X元素的氧化物、氢化物的水溶液都呈酸性

D．Y是周期表中非金属性最强的元素

Gambling, despite being a well known highly risky pursuit that has caused many tragedies, does not scare gamblers away; instead, many consciously join the legion of gamblers, in spite of possible failure in store for them.
How does a gambler get bogged down in such a risky occupation Most novices do not embrace an ambition to get rich through gambling. Instead, they might think gambling is merely an exciting game through which they can try their luck and bring excitement to their dull lives. Often, they win a small sum at the first several tries, and then became bold, daring to play for larger stakes. With certain encouraging "achievements", they are now confident of their good luck and gambling skill. At this point, they are at a crossroads: a step forward to become a professional gambler, or a step backward to return to normal life.
Unfortunately, most of them get bogged down in gambling, because the greedy notion of getting something for nothing is their underlying motive. Openly, they deny that they have such a shameful motive, but in the recesses of their soul, there is an undeniable ambition to get great sums of money through gambling. However, I’ve never heard of any myth about a person who got wealth and prestige through gambling. Instead, I’ve heard many true stories about gamblers who ended their lives in misery. Once a person gets bogged down in gambling, it is rather hard for him to tear himself away from that evil. Throughout history, few gamblers have ever repented about gambling, which led them to tragedy--failure in business, destitution, family disintegration, divorce, suicide, crime, etc.
What should a person do to get rid of such a nightmare It is very easy. To prevent getting involved in gambling, the most effective means is to stop at the first try. It is easy for any intelligent person to stop at the first try but it is also easy for a person of weak will to receive an "invitation" to have a try. The novice often finds an excuse for the first try, thinking or murmuring, "This is the only and the last try." In most cases, the novice will not stop at the first try--he will try again, and finally he will become an addict.
A "vindictive" psychology drives these new gamblers to be entrapped in gambling houses. As they lose some money, they get angry and try to "avenge" themselves, so that they play for higher stakes and lose more, until they sell all they have to get money and go back to the gambling house. Finally, they have debts beyond their capacity to pay. To dodge their debtors, they have to hide or escape, or take risky and criminal actions, for example, killing or threatening the debtors. Many gamblers end their lives in jail.

The author wrote this essay to

A．analyze gambler’s psychological reason of gambling.

B．criticize gamblers and gambling.

C．warn gamblers to stay away from gambling.

D．introduce the history of gamblin

“海洋时代”的来临——

材料一：托勒密留下的传统地理观念——赤道附近的海水会“沸腾”，南方炎热，生命无法存在。1418年的第一次试航就因为船员对赤道太恐惧而被迫返航。

“海洋时代”下的世界——

材料二：新航路开辟后，以欧洲为中心的资本主义世界市场逐步形成。

“海洋时代”下的中国——

材料三：有学者认为，18世纪中后期西方“选择了海洋”，中国“选择了陆地”。

材料四：有学者认为，洋务派是近代中国“海洋意识”较强的阶层，他们呼吁加强海防，开发海洋。

“海洋时代”下史学观念的演变——

材料五：15、16世纪以来人们通常使用“哥伦布发现美洲”的提法，“发现”的意思是“使所有人和所有民族都并入欧洲文明”。1984年，部分拉美学者倡议改称“美洲发现——两个文明汇合”。1992年，联合围教科文组织主张以“两个大陆相遇500年”为主题，举行哥伦布航抵美洲纪念活动。

材料六：20世纪70—80年代，西方史学界在世界历史的编纂方面总体上进人了全球文明史。“全球史观”的基本特征是：将人类社会的历史作为一个整体来看待……“各个相互影响的活动范围在这个发展进程中愈来愈扩大，各民族的原始闭关自守状态则由于日益完善的生产方式．交往以及因此自发地发展起来的各民族之间的分工而消灭得愈来愈彻底，历史也就在愈来愈大的程度上成为全世界的历史。”

按照材料六的研究角度来研究世界近代史，可能会对l5世纪—l9世纪末20世纪初的哪些重要事件评价较高？按照材料六的研究角度，评价航路开辟。