Unit Four

Warming Up

1、Xerox’s Palo Alto Research Center

2、Verizon

3、Amazon

Listening

Understanding Short Conversations

1~5 B A D D A

6~10 D C C A A

Understanding a Long Conversation

1~5 C B B B D

Understanding a Passage

1~5 A C B A C

Understanding a Radio Program

1 became Bill Gates' greatest contribution

2 makes use of Gates' system

3 was the plaything of nerds

4 became a business tool