选词(组)填空。

1. ________ butter do you need? (how many; how much )

2. ________ apples did you buy?(how many; how much )

3. -________ is the computer?   (how many; how much )

    -It's 5,000 yuan.

4. Could you please _______ the light for me? (turn on; open)

5. Please ________ the windows. It's very hot.(turn on; open)

6. Who ________ the radio just now?(turn on; open)

7. Please ________ your books and look at Page 108.(turn on; open)

8. Don't say that before we ________ the TV set.(turn on; open)

9. Look! All the doors are ________. (turn on; open)

如图为缩手反射的反射弧模式图，请分析并回答：（括号内填备选答案的代号）

（1）组成神经系统的结构和功能单位是______．

（2）写出图中数字所标注的结构名称：

“2”表示______，“3”表示______，“4”表示______

A．感受器       B．传入神经     C．神经中枢      D．传出神经     E．效应器

（3）神经冲动在反射弧中的传导顺序是______

A．4-→5-→3-→1-→2              B．2-→1-→3-→5-→4

（4）如因意外伤害事故，图中的“3”遭到损伤，则缩手反射活动______（能/不能）发生．