无脊椎动物与脊椎动物的根本区别在于（）
A．无脊椎动物的种数约占动物种数的95%
B．无脊椎动物的种数约占动物种数的5%
C．无脊椎动物身体里面没有脊柱
D．无脊椎动物身体里面有脊柱
答案：C
题目分析：对动物进行分类，除了要比较外部形态结构，还要比较动物的内部构造和生理功能，根据体内有无脊柱可以把动物分为脊椎动物和无脊椎动物两大类，脊椎动物的体内有由脊椎骨构成的脊柱，如家鸽，无脊椎动物的体内没有脊柱，如蝗虫，选C。
Don’t shoot butterflies with guns. Can you 36 someone running after a butterfly with a gun in his hands? Won’t such stupidity make you burst out laughing? But wait. Stop and consider how often you might have done something 37 . A hen, Henny-Penny, lived in a forest with many other animals and birds. One fine, sunny morning, she was busy looking for 38 in the ground. Suddenly she let out a frightened cackle (咯咯叫) with wings flapping 39 . A dry leaf had fallen down on her, and she went 40 at whoever she met, “Run, run for your lives; the sky is falling.” The other creatures stopped whatever they were doing. Some ran behind Henny-Penny, screaming warnings with her, while others 41 the unfounded story that the sky was falling. We all have 42 people like this hen. The rest of us are like the other foolish creatures who didn’t stop to verify (证实) the 43 for themselves. They shoot butterflies with guns. They just will not think for themselves. Why don’t people think for themselves? Often because of laziness, or because they don’t want to be 44 for their way of thinking. Walking through life 45 is more dangerous than crossing a busy road with eyes closed. Our thoughts should lead us towards the light of wisdom and sense. Our thinking should be high, 46 us to the ranks of the sensible. We have been blessed with reasoning, sensitive minds. Let us make use of them and be 47 of our own minds. Don’t let your mind be enslaved by someone else. Stop, think and then go ahead. 小题1:.
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