美国研究人员发现了一种含有集光绿色体的喜氧罕见细菌，每个集光绿色体含有大量叶绿素，使得细菌能够同其他生物争夺阳光，维持生存．下列有关该菌的叙述，正确的是（  ）

诺贝尔奖获得者丁肇中,在其实验中曾用到我国研制的一种闪烁晶体材料BGO(化学式为Bi₄Ge₃O₁₂),其中(Bi)元素为+3价,则(Ge)元素为      （）

从氧化还原的角度分析水在下列化学反应中只做还原剂的是 （　　）

通常被用来衡量一个国家或地区城市化水平高低的标志是　（   ）

用所给动词的正确形式填空。
    Be sure ____ (go) to this exhibition at the Sunshine Gallery. Ms. Wang ____ (consider) to be one of the best known Chinese photographers in the world today, and some of her most famous photos are in this exhibition. Ms. Wang ____ (get) to Sunshine Town yesterday afternoon. She really____ (have) something for everyone.  There are many great photos of the countryside. Maybe you ____ (see) some of them on TV before.  It's quite different when you see the real photos. Whatever you do, ____ (not miss) this exhibition!