M: When will the meeting begin
W: According to the schedule it should be at 9:30.
M: How long will it last
W: It will last for an hour and a half.

When will the meeting be closed（）

A. Scientists Searching for Metals with Special Power
B. New Methods of Searching for Minerals
C. Gold Could Be Found by Trees and Plants
D. A New Method of Searching for Minerals—Using Trees and Plants

A. He corrected the baby
B. He tried to stop the baby
C. He hid himself somewhere
D. He didn’t do anything