合法还击是指对方发球或还击后，本方运动员必须击球，使球直接越过或绕过球网装置，再触及对方台区。

剧烈运动时，肌肉CP含量下降很多，而ATP的含量变化不大。

他们都到海边去了。我为左眼发炎不曾去。我独坐在前廊，偎坐在一张安适的大椅内，袒着胸怀，赤着脚，一头的散发，不时有风来撩拂。清晨的晴爽，不曾消醒我初起时睡态；但梦思却半被晓风吹断。我阖紧眼帘内视，只见一斑斑消残的颜色，一似晚霞的余赭，留恋地胶附在天边。廊前的马樱，紫荆，藤萝，青翠的叶与鲜红的花，都将他们的妙影映印在水汀上，幻出幽媚的情态无数；我的臂上与胸前，亦满缀了绿荫的斜纹。从树荫的间隙平望，正见海湾：海波亦似被晨曦唤醒，黄蓝相间的波光，在欣然地舞蹈。滩边不时见白涛涌起，进射着雪样的水花。浴线内点点的小舟与浴客，水禽似的浮着；幼童的欢叫，与水波拍岸声，与潜涛呜咽声，相间地起伏，竞报一滩的生趣与乐意。但我独坐的廊前，却只是静静地，静静地无甚声响。妩媚的马樱，只是幽幽地微展着，蝇虫也敛翅不飞。只有远近树里的秋蝉，在纺纱似地缍引他们不尽的长吟。 在这不尽的长吟中，我独坐在冥想。难得是寂寞的环境，难得是静定的意境；寂寞中有不可言传的和谐，静默中有无限的创造。我的心灵，比如海滨，生平初度的怒潮，已经渐次地消翳，只剩有疏松的海砂中偶尔的回响，更有残缺的贝壳，反映星月的辉芒。此时摸索潮余的斑痕，追想当时汹涌的情景，是梦或是真，再亦不须辨问，只此眉梢的轻皱，唇边的微哂，已足解释无穷奥绪，深深地蕴伏在灵魂的微纤之中。 青年永远趋向反叛，爱好冒险；永远如初度航海者，幻想黄金机缘于浩渺的烟波之外：想割断系岸的缆绳，扯起风帆，欣欣地投入无垠的怀抱。他厌恶的是平安，自喜的是放纵与豪迈。无颜色的生涯，是他目中的荆棘；绝海与凶山蛱，是他爱取自由的途径。他爱折玫瑰：为她的色香，亦为她冷酷的刺毒。他爱搏狂澜：为他的庄严与伟大，亦为他吞噬一切的天才，最是激发他探险与好奇的动机。他崇拜冲动：不可测，不可节，不可预逆，起，动，消歇皆在无形中，狂飙似的倏忽与猛烈与神秘。他崇拜斗争：从斗争中求剧烈的生命之意义，从斗争中求绝对的实在，在血染的战阵中，呼叫胜利之狂欢或歌败丧的哀曲。 幻象消灭是人生里命定的悲剧；青年的幻灭，更是悲剧中的悲剧，夜一般沉黑，死一般凶恶。纯粹的，猖狂的热情之火，不同阿拉丁的神灯，只能放射一时的异彩，不能永久地朗照；转瞬间，或许，便已敛熄了最后的焰舌，只留存有限的余烬与残灰，在未灭的余温里自伤与自慰。(节选自徐志摩《北戴河海滨的幻想》)

若直线l：ax+2y+6=0与直线l2：x+(a-1)y+(a2-1)=0平行且不重合，则a的值是______。

《义务教育语文课程标准(2011年版)》指出，口语交际的评价，应按照不同学段的要求，综合考查学生的参与意识、情感态度和__________。

夸美纽斯指出：“凡是需要知道的事物，都要通过事物本身来进行教学；那就是说

下列哪首曲目不属于江南丝竹的八大名曲?______

“正始之音”的文学作品特征是( )。

维果茨基提出“教育应走在发展前面”的含义是______。

如何在教学中促进学生的可持续发展?

Mr. White works in an office. He liked reading in bed when he was at school. It was bad for his eyes and now he has near sight (近视) - But he wouldn't like【C1】______to know about【C2】______and he never wears a pair of glasses, and it often【C3】______him some trouble. One winter morning he was sent【C4】______a village school on business (出差). He【C5】______the bus at a stop in a small town. Then he had to【C6】______there. The road to the village wasn't smooth (平坦的) . He fell over some times and it【C7】______his clothes dirty. At last he got to the village. Suddenly it began to blow and it got colder. He was looking for the school while his hat was blown off. He began to run after it but he couldn't get it. He couldn't understand why his hat ran into a house as if(似乎)it had【C8】______. And he ran into the house, 【C9】______ A woman stopped him and shouted angrily, 【C10】______are you running after my hen for?"

FivepilotslandedJ-15fighterjetsontheLiaoning,China'sfirstaircraftcarrier______thecritics,whooncedescribeditasasharkwithoutteeth.

计算：

______是人与人之间实现信息交流的中介，也称为媒介。

Chinese proverbs are rich and they are still widely used in Chinese people's daily life.【D1】______these proverbs there are often interesting stories. For example, the proverb, plucking up a crop【D2】______(help) it grow , is based on the following story. It is said that a short-tempered man in the Song Dynasty (960—1279) was very anxious to help【D3】______rice crop grow up quickly. He was thinking about【D4】______day and night. But the crop was growing much slower than he expected. One day, he came up with an idea 【D5】______he would pluck up all of his crop a few inches. He did so the next day. He was very tired【D6】______doing this for a whole day, 【D7】______he felt very happy since the crop did grow【D8】______ (high). His son heard about this and went to see the crop. Unfortunately the leaves of the crop began to wither. This proverb is saying we have to let things go in their【D9】______ (nature) course. Being too anxious to help an event develop often【D10】______ (result) in the contrary to our intention.

《黄河船夫曲》创作的素材是______。

学习策略是多样化的

双方在信息拥有上的差异(对话的一方拥有的信息而另一方没有)叫做______(英文：______)。

中小学课外活动的基本形式是______

下面是中外教育家关于教育的论述： 荀子说：“干越夷貉之子，生长同声，长而异俗，教使之然也