我国的陆上疆界和海岸线长度分别是千米（    ）

199. How can you      if you are not__________?

小豪在“测定小灯泡电功率”的实验申，小灯泡的额定电压为2.5V，电阻约为10Ω。（1）如图12所示是他连接的实验电路，其中有不根导线连接错误。请你在错误的导线上画“×”，并用笔画线代替导线画出正确的导线。
    
（2）电路连接正确后，闭合开关，发现小灯泡不亮，电压表有示数，电流表指针几乎不动，产生这十现象的原因是                                                        (1分)
（3）排除故障后，继续实验，并根据实验数据画出如图13所示的U-I图像，计算出小灯泡的额定功率是                 W  (1分)，请你将小灯泡正常工作时的电流在如图14的电流表中标出。

(4)根据图像可判断小灯泡的电阻随电压升高逐渐           ，原因是                
                                      。(每空1分)

下列能被碱性染料染成深色的是（）

根据短文内容，用方框中所给词的适当形式填空。每词限用一次。

    Different people have different kinds of hobbies. Some like reading and drawing. Some like playing sports and some like collecting stamps. I have many good friends. They all have their____hobbies. When they were young, they usually____with doll. Now they grow up, they start to have other hobbies. Some of them go out____a sport like football or skating. Some like collecting____and stamps. Some of the most____hobbies are watching TV plays and listening to music. I used to read books____draw pictures. I could learn many useful things.

    People will spend a lot of____training hobbies. Some of them may be____in playing the piano for many years. While some others may____their interests very often.

    Why do people need hobbies? I think a hobby is something we are____of doing. The main goal（目标） of a hobby is to give us a break from our work or study.