If the value-added tax were done away with, it would act as a ___ to consumption. A. progression B. prime C. stability D. stimulus 查看完整题目与答案 Unfortunately, the new edition of dictionary is ___ in all major bookshops. A. out of reach B. out of stock C....
白天仍会觉得很困，常常不分时间、地点地又睡着了。由于患者的睡眠结构异于常人，一旦入眠就直接进入快速动眼期睡眠，而不是正常人那样经过深度睡眠方才进入。该病的主要原因是大脑内食欲肽（下丘脑泌素）变少。食欲肽能让人更好地保持在清醒的状态，缺少则会导致人的睡眠和清醒状态轻易转换。这种物质...Summer...