单项选择题

一方在说，另一方没有在听,是什么的表现

A．关闭频道
B．争夺频道
C．交叉频道
D．沟通停止

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16.Where are the volunteers of the Tutoring Center from?
They are from different                          of the college.
17.What is the purpose of the Tutoring Center?
To offer                             to students in need.
18.When is the center open every week?
Monday,Wednesday and                                 .
19.When can students come to the center for help?
Any time in its                                      .
20.What are the students asked to do if they need homework help?
Introduce themselves to the tutors and let them know about                               .

答案： (1)
departments

单项选择题

They need one more point to ______ down the victory.

A．break
B．nail
C．take
D．put