问题
选择题
人的大脑皮层大约有多少个神经细胞( )
A.1400万
B.140万
C.140亿
D.160亿
答案
大脑半球的表层是灰质,叫大脑皮层,平均厚度约2--3毫米,大脑皮层表面有许多凹陷的沟和隆起的回,大大增加了大脑皮层的表面积和神经元的数量,大脑皮层的总面积有二千二百平方厘米,约含有140亿个神经元;这是与大脑皮层的功能相适应的.
故选:C
人的大脑皮层大约有多少个神经细胞( )
A.1400万
B.140万
C.140亿
D.160亿
大脑半球的表层是灰质,叫大脑皮层,平均厚度约2--3毫米,大脑皮层表面有许多凹陷的沟和隆起的回,大大增加了大脑皮层的表面积和神经元的数量,大脑皮层的总面积有二千二百平方厘米,约含有140亿个神经元;这是与大脑皮层的功能相适应的.
故选:C
情景交际。从方框中选择适当的句子补全对话(其中有两项是多余的)。(5分) A: Hi, Janet. Would you like to help protect the environment? B: I’d love to. 小题1: A: Well first, you can start by turning off the lights before you leave the room. B: Yes. That’s easy. Sometimes I turn on the lights without thinking. A: Second, you can ride a bicycle. 小题2: B: That will save money, too. 小题3: A: The third idea is turning off the shower when you’re not using it, B: You mean, when I have shampoo(香波) in my hair? A: Yes. 小题4: Every minute helps. And fourth, take a bag when you go shopping. Don’t use plastic bags. B: OK. 小题5: I’ll tell them.
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