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40. According to the passage, which of the following statements is TRUE?
(A) Causes of insomnia are not found yet.
(B) Cheese can help people sleep well.
(C) Regular exercise can prevent you from sleeping well.
(D) Tryptophan is a chemical that can cause insomnia.
(E) Taking a bath may make you feel less sleepy.
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統計： A(0), B(78), C(2), D(2), E(3) #2718030
統計： A(0), B(78), C(2), D(2), E(3) #2718030
