问题 单项选择题

各种可兴奋组织产生兴奋的共同标志是()。

A.肌肉收缩

B.腺体分泌

C.神经冲动

D.动作电位

E.局部电位

答案

参考答案:D

解析:生理学中把可兴奋细胞受刺激后产生动作电位的能力称为细胞的兴奋性。

完形填空

Long before, there was a large mountainside, where rested an eagle's nest with four large eagle eggs. One day   小题1:   earthquake rocked the mountain, causing one of the eggs to roll down the mountain to a chicken farm  小题2:   (locate) in the valley below. The chickens were kind enough to care for the eagle's egg, and an old hen volunteered to nurture (哺育) and raise the large egg.

One day, the egg hatched and a beautiful eagle was born. Sadly, 小题3: , the eagle was raised to be a chicken. Soon, the eagle believed he was nothing more   小题4: a chicken. The eagle loved his present family, but his spirit cried out   小题5:  more. While playing on the farm one day, the eagle happened to notice a group of mighty eagles soaring in the skies. "Oh," the eagle cried, "I wish I could soar like those birds."

The chickens roared with 小题6: (laugh), “You cannot soar with those birds. You are a chicken and chickens do not soar."

The eagle continued staring at his real family up above,  小题7: (dream) that he could be with them. Each time the eagle would let his dreams  小题8: (know), he was told it couldn't be done. That is  小题9:  the eagle learned to believe. The eagle, after time, stopped dreaming and continued to live like a chicken. Finally, after a long life as a chicken, the eagle passed away.

You become what you believe you are. So, if you ever dream of becoming an eagle, follow  小题10:   dreams... not the words of a chicken.

判断题