如图所示是光电管的原理图，已知当有波长为λ₀的光照到阴极K上时，电路中有光电流，则（   ）

       "他经常穿着大人丢掉不要的破衣烂衫，全身一年四季都在开花，衣服上绽开的破布条随着他的蹦蹦跳跳而飘舞.他头上戴着一个很大的破帽子，一块弯月亮样的帽边搭拉下来遮住了半边脸，肥大的上衣几乎拖到脚跟，裤子只一根背带挎在肩上，另一根背带不知哪里去了，裤裆像个大口袋吊在两腿之间，一只裤脚卷着，还有一只毛了边的裤脚拖到地上，走一步带起一阵灰尘."这段文字选自____ （作者）写的《____ 》，选段中的“他”是指 ____ 。

A.  B.  C.  D.  E.

⑴____My friend's a boy. His name's Bill. He's ten. He's tall. He has short hair. He has grey shorts. He has a skateboard.

⑵____My friend's a girl. Her name's Polly. She's eight. She's short. She has short hair. She has a blue dress. She has a cat.

⑶____My friend's a girl. His name is Jill. She's eleven. She's thin. She has a skateboard. She can play on the skateboard.

⑷____My friend's a girl. Her name's Amy. She's twelve. She's tall. She has long hair. She has a blue skirt. She can fly a kite.

⑸____My friend's a boy. His name's Mark. He's eleven. He's short. He has long hair. He has a pair of jeans. He likes riding a bicycle.