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【简答题】
某学习小组对以下动物进行了调查和分类研究，请帮助他们完成下列问题：（12分） A. 海马 B. 猕猴 C. 蚯蚓 D. 蝗虫 E. 家鸽 F. 青蛙 （1）学习小组将上述生物分为A、B、E、F和C、D两类，其分类的主要依据是______________________________。 （2）学习小组同学调查到海马有以下特征：身体侧扁，全身无鳞，有脊柱，在水中能以直立状前进，有鳍，用鳃呼吸，终生生活在水中。他们认为海马应该属于鱼类，因为海马具有两个能在水中生活的重要特点：①_____________；②_____________。 （3）E和F都是卵生，但受精方式不同，E、F的受精方式分别是_____________________，且F的受精受水的限制，而E则不受水的限制，因此E的分布范围更加广泛。 （4）C与D结构相同之处是身体许多体节构成，但它们的呼吸器官不同，分别是_____________。C和D相比，D的运动能力比较强，它有__________________________，因而能跳跃和飞行，而C则没有这些结构及相关的运动功能。C和A、B、E、F相比，C不能快速运动的重要原因是__________________________。 （5）D和F都是变态发育，D的个体发育过程与家蚕相比少了_____________期，F的发育过程是：受精卵→_____________→_____________→成蛙。 （6）在上述动物中，学习能力最强的是_____________（填序号），这种动物营群体生活，具有一系列的社会行为，请写出社会行为的一种重要特征：_________________________。
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A.
(s>=-1) & (s<1)< /div>
B.
-1<= s<1
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A.
concerning
B.
until
C.
unless
D.
provided
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A man looks in a mirror and, as a result, of the effect of cognition, sees his own reflections.
B.
One thought in a sentient entity leads, by virtue of the stream of consciousness, to another thought.
C.
A match is struck, and through the effects of a physical law, it ignites into flame.
D.
Every time a ping-pong ball is bounced, a tree falls, but through no causal relationship.
E.
A human being makes a mental judgment based on physical phenomena he has observed.
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【单选题】能正确表示数学关系式 -1≤s<1的表达式为( )。
A.
(s>=-1) & (s<1)< /div>
B.
-1<= s<1