题目

Some people would prefer to stop the use of man-made chemicals in agriculture entirely. What keeps them from doing so is the fact that chemical farming serves the high demand for food around the world. Organic farming is nowhere near able to meet that need. Therefore, there is still a long way to find a suitable solution that puts sufficient food on the dinner table while keeping people and the environment as healthy as possible.影片《阿凡达》出现了一种潘多拉星球的宇宙飞船。右表是元素周期表中的一部分，表中所列字母分别表示一种元素。（选项中的物质都是由下表中的元素组成）根据以上信息可推断下列说法正确的是 A．e和f组成的化合物可吸收宇航员在宇宙飞船活动舱内产生的由d和f组成的气体 B．活动舱内还要营造一种适合宇航员生存的人工生态环境，即充入a和f的常见单质 C．c和f以原子个数之比为1∶1组成的化合物可用作宇航员所需f单质的来源 D．若潘多拉星球上存在b，地球上此元素主要以b形式存在，b比b少一个质子