下颌全口义齿的内、外斜嵴及牙槽嵴上的一切骨突区属于（） A.主承托区 B.副承托区

根据短文内容，判断下列句子正（A ）误 ( B ) 。

     We are all busy talking about and using the Internet (互联网), but how many of us know the history of

the Internet? 　　

     Many people are surprised when they find that the Internet was set up in the 1960s. At that time,

computers were large and expensive. Computer networks (网络) didn't work well. If one computer in the

network broke down, then the whole network stopped. So a new network system had to be set up. It should

be good enough to be used by many different computers. If part of the network was not working, information

could be sent through another part. In this way computer network system would keep on working all the time. 　　      At first the Internet was only used by the government, but, in the early 1970s, universities, hospitals and

banks were allowed to use it too. However, computers were still very expensive and the Internet was difficult

to use. By the start of the 1990s, computers became cheaper and easier to use. Scientists had also developed

software that made 'surfing' (浏览) the Internet more convenient. 　　

     Today it is easy to get on-line (上网) and it is said that millions of people use the Internet everyday. Sending e-mail is more and more popular among students. 　　

     The Internet has now become one of the most important parts of people's life.

( )l. The Internet has a history of less than thirty years.                               

( )2. In the 1960s computer networks went wrong easily.                                   

( )3. Computers become cheaper so that many hospitals and banks were allowed to use them  

( )4. People didn't have enough software to get on-line conveniently until the early 1990s.

( )5. The Internet has now become one of the most unimportant parts of people's life.     

关于腐蚀性胃炎的治疗错误的是（）

A.立即洗胃及内镜检查

B.镇痛

C.补液

D.口服牛乳

E.应用抗生素

物质之间既相互联系，又存在规律，这是我们学好化学应该掌握的一种基本方法。

（1）寻找规律，在横线上填上相应的化学式或名称：

①氯元素常见的化合价有－1、＋1、＋3、＋5、十7，下面五种物质都是含氯元素的酸。 HC1O₄（高氯酸）、______（氯酸）、HC1O₂（亚氯酸）、HC1O(次氯酸）、HC1（氢氯酸）

②有机化合物里有一类物质叫烷烃，分子中碳、氢原子个数呈一定的规律。 CH₄（甲烷）、C₂H₆（乙烷）、C₃H₈（丙烷）、　　 　　（丁烷）……

（2）请你仿照下表中的示例，找出O₂、CH₄、CO₂、NH₃、C₂H₄（乙烯、）五种气体之间存在的另外两个规律，并排列出顺序，将答案填在下表中的空格内。

房间隔缺损()
法洛四联症()
室间隔缺损()

A．电轴左偏，左室高电压

B．P-R间期延长

C．期前收缩

D．不完全性右束支传导阻滞

E．右心室肥大

证券交易所可以对每一证券的市场融资买入量和融券卖出量占市场流通量的比例、融券卖出的价格作出限制性规定。（　　）