21. I have suffered from _______ for two weeks, and counting sheep does not work at all. Maybe sleeping pill is the only solution now.
(A) insomnia
(B) rabies
(C) cholera
(D) MERS
(E) arrhythmia
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統計: A(3), B(0), C(0), D(0), E(0) #3341246
統計: A(3), B(0), C(0), D(0), E(0) #3341246