The ______ in e-mail messages has affected almost every computer around the world and has caused the damage of up to US$1 billion in North America.

● The （72） in e-mail messages has affected almost every computer around the world and has caused the damage of up to US$1 billion in North America.（72）

The(72)in e-mail messages has affected almost every computer around the world and has caused the damage of up to US$1 billion in North America．

In information theory, "information" is regarded as knowledge which reduces or removes(71) about the occurrence of a specific event from a given set of possible events. The concept "event" is to be understood as used in the theory of probability. For instance, an event may be the occurrence of a(72) character or word in a given message or in a given position of a message.In communication theory, channel is defined as that part of a communication system that connects the message source with the message sink. An encoder may be inserted between the message source and the input to the channel, and a(73) between the output of the channel and the message sink. Generally, these two units are not considered as being parts of the channel. In certain cases, however, they may be considered as pans of the message source and message sink,(74) In information theory(75) to Shannon, the channel can be characterized by the set of conditional probabilities of occurrence of all the messages received at the message sink when a given message emanates from the message source.

E-Mail is a fast，cheap and convenient way to(72)messages locally and internationally．

●In the following essay, each blank has four choices.Choose the best answer and write down on the answer sheet.connectexchangecommunicategame(72)

The quality of the message can be affected by（）.

Have you ever known the mobile phone has a ______ history? It is said that the world’s first mobile phone was made in the 1970s.

Mary says this is the _____ decision she has ever made in her career life.

Mary，says this is the ______ decision she has ever made in her career life.

You add a particular e-mail address to the Blocked Senders list in the Microsoft Windows Mail application. You still receive messages from this e-mail address. You need to prevent the receipt of all e-mail messages from this e-mail address. What should you do?（）

Hannah finished building her new all-purpose projects room last year, and she has been working in the room ever since.