对某导电元件（圆柱状）进行研究，图甲是说明书中给出的伏安特性曲线．

（1）用多用表的欧姆挡试测元件在常温下的电阻，操作步骤正确，发现表头指针偏转的角度过大或过小时应选用其它挡位测量，换挡后进行测量之前，应当______．

（2）可由U-I图线得到各状态下的电阻值，为了进一步研究材料电阻率，需要测量元件的长度和截面直径，如图乙，用螺旋测微器测得的直径读数为______mm．

（3）实验室中提供以下器材：

A．电压表V（量程为0～3V，内阻约5kΩ）B．电流表A（量程为0～0.6A，内阻约0．lΩ）

C．滑动变阻器R₁（0一l0Ω，额定电流1.5A）

D．滑动变阻器R₂（0一l000Ω，额定电流0.5A）

E．直流电源（电动势3V，内阻忽略不计）    F．电键一个、导线若干

设计一个电路，验证该元件的伏安特性线是否和说明书中所给的一致，则滑动变阻器应选择______；试在图丙方框中画出实验原理图．

用适当的词填空。

1. Look, Sandy! I can see a man ________ beside that box!

2.  —Is there any sugar in my tea, Sue?

     —_______ it, Sandy.

     —Ugh! It's not very nice. This isn't tea! It's coffee!

3. It's not very nice, mum. There isn't any milk ________ sugar in it.

4. —Let me help you, mum. I can ________ the bread.

    —All right, Sue.

5. Take ________ a piece of paper, children.

    Now you can all ________ a picture.

6. He's ________ a bar of chocolate in his right hand, and a ________ of  lemonade in his left hand.

7. —Let me help you.

    —All right,Sue. ________ that cupboard.

8. Sugar, tea, jam, oranges…

    And bananas ________ Sandy and me.

9. Mother is still ________ her shopping-list.

    Sue is still ________ her.

10. Do you want ________ beans now, Sandy?

      Yes, please.

11. —Good morning, Mr Green.

      —Good morning, Sue.

      —My mother wants a ________ of tooth-paste and a small bar of  _______, please.