通过制定和切实有效地执行规章与公约，确保社区居民遵循社会规范和社会价值，这主要是指社

下边的漫画告诉我们 [     ]

A．要想提高学习成绩，就必须远离电脑与网络

B．中学生上网有害无益，只会使学习成绩下降

C．青少年沉溺于网络，不利于自己的健康成长

D．网络是一把双刃剑，弊大于利

一盒彩色粉笔2.4元，一盒白色粉笔比彩色粉笔便宜0.5元。买彩色粉笔和白色粉笔各一盒，要多少元？

E

71    It might understand more than you think．

A dog named Rico recognizes the names of about 200 objects, say researchers in Germany．   72   Its word-learning skills are as good as those of a parrot or chimpanzee．

In one experiment，the researchers took all 200 items that Rico is supposed to know and divided them into 20 groups of 10 objects．   73   In four tests，Rico got 37 out of 40 commands right．As the dog couldn’t see anyone to get clues，the scientists believe Rico must understand the meanings of certain words．

In another experiment，the scientists took one toy that Rico had never seen before and put it in a room with seven toys whose names the dog already knew．   74    

The correct object was chosen in seven out of 10 tests．suggesting that the dog had worked out the answer by process of removing．A month later，Rico remembered half of the new names，which is even more impressive．

75   Even if they do，they can’t talk back．Still，it wouldn't hurt to sweet-talk your dog

every now and then You might just get a big，wet kiss in return!

A．The owner then told Rico to fetch the object，using a word the dog had never heard before

B．Do dogs more understand us than some friends?

C．It’s hard to know if all dogs understand at least some of the words we say．

D．Be careful what you say around your dog． E．The dog also appears to be able to learn new words

F．Then the owner told the dog to go and fetch one of the items and bring it back．

G．Rico is thought to be smarter than the average dog．

一个企业发送订单到另一个企业，以便制造和发货。制造商的SOA管理策略要求对原始的订单请求进行单点验证。在哪一点进行验证最好。（）

A.ESB

B.SOAP security header

C.在防火墙

D.在UDDI registry

回收塔采用真空操作，目的是（）

A.防止溶剂受热分解，造成损耗

B.防止压力过高，造成溶剂分解

C.防止芳烃沸点过高，难以分离

D.防止压力过高，损坏设备