色素上皮细胞层的生理功能有（）

A.维生素A的转运和代谢

B.起到光感觉器活动的色素屏障的作用

C.选择性转送视网膜与脉络膜之间的营养和代谢物质

D.吞噬并消化光感受器外节脱落膜盘

E.药物解毒，合成黑色素和细胞外基质

所给单词的正确形式填空.   

1. My brother __________ ( have ) a baseball bat .

2. They have many __________(club) .

3. —Let 's watch TV. 

    — That ___________( sound) interesting .

4. She _________________ ( not have )a great collection . 

5. Does Jim ___________  (have ) a ping-pong ball ?