（1）Who gave the call？
A.Mark.
B.Judy.
C.Mr.Black.
（2）What will Mr.Black talk about？
A.Noise pollution.
B.Water pollution.
C.Air pollution.
（3）When will Mr.Black give a talk？
A.At ten o'clock on the morning of April 26th.
B.At ten o'clock on the morning of May 26th.
C.At ten o'clock on the morning of April 28th.
（4）Where will they listen to the talk？
A.In the first meeting room.
B.In the second meeting room.
C.In the third meeting room.