计算32÷（-13）3-24÷（-12）得______．

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问题填空题

计算3²÷（-

）³-2⁴÷（-

）得______．

答案

3²÷（-

）³-2⁴÷（-

）=9×（-27）-16×（-2）=-243+32=-211；

故答案为：-211．

补全对话，情景问答

例:	— What did you do on your holiday? — I ate good food.
1.	— What did you do on your holiday? — ____________________________.
2.	— What did you do on your holiday? — ____________________________.

单项选择题

神经纤维兴奋的标志是()

A．阈电位

B．局部电流

C．锋电位

D．局部电位

E．极化状态