单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. What does the passage mainly discuss

A．How canals are constructed.
B．Common types of canal boats and barges.
C．The world’s largest canals.
D．How canals are used and classified.
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问答题
[听力原文]Social distance may affect how openly employees speak about their work. People of the same rank may talk frankly to one another about how things are going. However, they may be less honest with someone higher up in the hierarchy—for fear of prejudicing their position in the company. For this reason employees often alter the facts to tell the boss what he or she wants to hear. One way of reducing social distance is to cut down the ways in which employees can indicate higher status.Physical distance can affect how well people communicate. The farther away one person is from another, the less often they communicate. Some research has shown that when the distance is more than 10 meters, the probability of communicating at least once a week is only 8%. The most important thing for all managers to remember is that communication is a two-way process. They should encourage their employees to ask questions and to react to what the managers are saying.
单项选择题
His composition is quite good ______ a few minor grammatical mistakes.
A．excluding
B．except for
C．besides
D．except
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