49. The main idea of Paragraph 5 is that _________.
(A) people should probably sleep more than they do
(B) Americans on average sleep less than they did 20 to 30 years ago
(C) people die if they don't get enough sleep
(D) people get sick because they don't sleep enough
(E) people need enough food and exercise as much as they need sleep
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統計: A(27), B(8), C(1), D(21), E(10) #2751944
統計: A(27), B(8), C(1), D(21), E(10) #2751944