什么是《烟草广告管理暂行办法》所称的烟草广告？

A businessman sent his son to learn the secret of happiness from the wisest man. The boy walked through the desert for forty days      he reached a beautiful castle at the top of a mountain where the Sage (圣人) lived.

When he      a room, he saw lots of strange views: businessmen coming and going, a small music group      sweet music, and all kinds of delicious dishes on a large table.

The Sage      everyone. The young man had to wait for two hours until it was his     .

        enough patience, the Sage listened to the boy, but he was too      to explain to him the secret of happiness.      he suggested that the boy would walk around his palace and come back in two hours.

“However,” he added, handing the boy a teaspoon with two drops of oil in it, “while you walk,      this spoon and don’t let the oil spill.”

The boy began to walk around the palace,      keeping his eyes fixed on the spoon. At last he returned to the Sage.

“So,” asked the Sage, “did you notice anything amazing in my palace?”     , the boy said that he had seen nothing. He was only concentrating on the     .

“OK. Now go back and see the wonders of my world,” said the Sage. Now more     , the boy took the spoon and walked again through the palace. Returning to the Sage, he exactly reported all      he had seen.

“But where is the oil?” asked the Sage. Looking down at the spoon, the boy realized that he had spilled it all.

“Well, the secret of happiness lies in looking at all the wonders of the world and never      the two drops of oil in the spoon,” the Sage said with a smile. They were both important. Then the boy realized what happiness was.

科学研究发现：金星大气层的成分之一是三氧化二碳（C₂O₃），实验证明三氧化二碳的化学性质与一氧化碳相似．下列关于三氧化二碳的说法中，不正确的是（　　）

A．C₂O₃能使澄清石灰水变浑浊

B．C₂O₃在O₂中充分燃烧的产物为CO₂

C．C₂O₃在一定条件下能还原氧化铁

D．C₂O₃中碳的化合价为+3价

信息系统的安全是一个系统的概念，包括了信息系统（）

A.实体的安全

B.网络设计的安全

C.数据的安全

D.运行的安全

E.软件的安全

关于固定期间选择权，下列说法不正确的是( )。

A．在固定期间选择权下，保险公司同意在约定期间内向受益人分期给付等额保险金

B．付款金额由保险金及其所产生的利息构成

C．每次付款的金额主要取决于通货膨胀率、利率以及投保人选择的给付期间长度

D．分期付款可以每年或每半年支付一次，也可以按月支付，只要每月的支付金额不低于保险公司约定的最低金额

水中悬浮的粒子如砂土、铁锈等将同时受到沉降力和（）作用。

A.重力

B.范德华力

C.吸引力

D.切力