单项选择题

A．float
B．sink
C．buoyant
D．drift
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单项选择题
A．Two students.B．A student and a parent.C．A teacher and a student.D．A student and a supervisor.
A．Two students.
B．A student and a parent.
C．A teacher and a student.
D．A student and a supervisor.
单项选择题
A．He only focuses on what he is going to say.B．He is only interested in his own work.C．He has poor hearing.D．He is always lost in thought.
A．He only focuses on what he is going to say.
B．He is only interested in his own work.
C．He has poor hearing.
D．He is always lost in thought.
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