单项选择题


A．strange
B．painful
C．peaceful
D．natural
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单项选择题
A．sure ofB．careless aboutC．pleased withD．disappointed at
A．sure of
B．careless about
C．pleased with
D．disappointed at
单项选择题
The problem becomes worse due to ______.
A．the increasing number of patients
B．the widespread medical knowledge on the Internet
C．the patients' regular visits to doctors that occupy too much time
D．new diseases and symptoms emerge constantly
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