问题 单项选择题

公钥加密比常规加密更先进是因为( )。

A.公钥加密比常规加密更具有安全性

B.公钥加密是一种通用机制,常规加密已经过时了

C.公钥是建立在数学函数基础上的,而不是建立在位方式的操作上的

D.公钥加密算法中,公钥的分发比常规加密高效

答案

参考答案:C

解析: 公钥加密技术又称非对称加密,建立在数学函数基础上,是一次革命性的进步。

单项选择题
阅读理解

The Red Cross is an international organization which cares for people who are in need of help. A man in a Paris hospital who needs blood, a woman in Mexico who was injured in an earthquake, and a family in India that lost their home in a storm may all be aided by the Red Cross.

The Red Cross exists in almost every country around the world. The world Red Cross organizations are sometimes called the Red Crescent, the Red Mogen Daid, the Sun, and the Red Lion. All of these agencies share a common goal of trying to help people in need.

The idea of forming an organization to help the sick and wounded during a war started with Jean Henri Dunant. In 1859, he observed how people were suffering on a battlefield in Italy. He wanted to help all the wounded people regardless of which side they were fighting for. The most important result of his work was an international treaty called the Geneva Convention(日内瓦协定). It protects prisoners of war, the sick and wounded, and other citizens during a war.

The American Red Cross was set up by Clara Barton in 1881. Today the Red Cross in the United States provides a number of services for the public, such as helping people in need, teaching first aid and providing blood.

小题1:A good title for this passage is     .

A.People in Need of Help

B.Safety and Protection

C.The International Red Cross

D.Forming an Organization to Help People小题2:The word “aided ” in the first paragraph means     .

A.needed

B.helped

C.caught

D.protected小题3:The author really tries to make the reader see that this organization     .

A.costs very little money

B.works in many nations

C.teaches first aid if necessary

D.is called the Sun小题4:We may draw a conclusion (下结论)that      during a war.

A.the Red Cross only protects the wounded

B.the Red Cross only helps prisoners of war

C.the Red Cross only helps citizens

D.the Red Cross helps all the people in need no matter which side they are fighting for