第 37 題至第 40 題為篇章結構題組，各題請依文意，從四個選項中選出最合適者，各題答案內容不重複：I

37
(A)They also found that during sleep, the brain’s cells shrink, or become smaller.
(B)While we sleep, our brains are doing much more than getting ready for the next day.
(C)She said the results demonstrate just how important sleep is to health and fighting disease.
(D)The brain expert says our brains perform two very different jobs.