下列对文学常识的判断和表述，正确的一项是

A．建安时期是文学的自觉时代，后人把建安诗歌这种建筑在慷慨情怀基础上的爽朗刚健的风貌，称为“建安风骨”。

B．“花间派”词人以温庭筠、周邦彦为代表，在填词时往往取当前情事，表现艳遇怨慕与离愁别绪，藻丽浓艳，细美婉约，构成“香而软”的风格。

C．南北朝时期，诗歌创作的一大成就是民歌的新发展，其中《木兰辞》叙事与抒情相渗透，细腻与粗犷相融合，代表了南朝民歌的最高成就。

D．陶渊明是中国诗歌史上大力描写山水的第一人，开创了山水诗派，直接引领了王维、孟浩然等人的山水诗创作。

Enough sleep is important to health. The amount of sleep needed __31________ on the age of the person and the conditions in ___32_______ sleep takes place. The young may need more sleep than ___33_______ old, but usually eight hours are enough for the health of grown-ups. Some can do with __34________ than this amount, but others may need more. Every person knows his own need. ___35_______ is then a matter of good judgment to satisfy his need. Sleep __36________ always be enough to make one bring back his __37________ (strong) and get ready for a day’s work.

Fresh air is necessary to sound sleep. So it is not __38_________ reason for some people to think that it is practicable to sleep in the open air. A bath at bedtime, __39________ hot nor cool but of body temperature, may be helpful to sleep. Sleep-producing drug(帮助睡眠的药物) should never be taken except when ___40_________ (suggest) by a doctor.