单项选择题

A．Since
B．Because
C．When
D．While
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单项选择题
A．whoseB．whichC．whatD．who
A．whose
B．which
C．what
D．who
单项选择题
According to the speaker, why would thermography be non-threatening to patients
A．It is not painful.
B．Patients can see the pictures.
C．The process is very relaxing.
D．No radiation is involved.
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