图1是小明设计的调光电路图，他将粗细均匀的电阻丝AB通过滑片P连入电路，小灯泡的额定电压为6V．闭合开关S后，滑片P从最左端A滑到最右端B的过程中，小灯泡的I﹣U关系图象如图2所示．（电阻丝AB的阻值不随温度变化）

求：（1）小灯泡的额定功率；

（2）电阻丝AB的阻值；

（3）当AB连入电路的阻值R₁=2.5Ω时，灯泡消耗的功率为3.2W，此时灯丝的阻值为多少．

读短文，将人物和图片连线。

    My name is Yaoyao. I'm in Sydney. It's very hot. I wear a beautiful dress. Mike is going to Beijing next week. It's winter in Beijing now. He should wear gloves. Bill is in the USA. He should wear trousers. Joy is in her room. It's very warm. She wear a shirt. Binbin is playing football now. He is wearing socks.

① ____   A.

② ____   B.

③ ____   C.

④ ____   D.

⑤ ____   E.

如图是显微镜下观察到的某种陆生植物叶的上下表皮（ab表示细胞）．以下判断错误的是（ ）