图示农田生态系统中部分生物之间的关系．请分析并回答问题．

物体大多数是由____、____、____、____四种基本的简单形状构成的。

在长征途中，***非常重视情报工作，及时掌握敌方的部署与动向，根据敌我双方力量的变化，寻找敌方薄弱环节，灵活调动军队，四渡赤水，终于摆脱了敌兵的围追堵截。***用兵如神的奥秘在于（    ）

①重视调查研究，依据不断变化的情况决定军事部署

②把对战争规律的真理性认识作为军事行动的出发点

③善于在瞬息万变的战场形势中掌握和利用战争规律

④认识到红军将士的主观能动性在战争中起决定性作用

    New Year's Day is coming. The students in Class 8 are preparing for a New Year's party. Cindy and Mary are malting red paper birds They want to put them outside (在……外面) the classroom  Lily and Alice are cleaning the desks and chairs They want a clean classroom. There are some pictures on the walls and there are also some beautiful flowers on the desks. Some boy students are learning taijiquan in the playground. They want to show (展示) it at the party. Where are Jack and Nancy? Oh, they are still in the shop. They are buying some food and drinks for the party. "We are very happy because we can have a big party," says Mike, the monitor (班长).

如图所示，质量相同的两物体处于同一高度，A沿固定光滑斜面下滑，B自由下落，最后到达同一水平面（   ）