题目

His grandmother is eighty. She's ___good health. A . at B . in C . with 答案：B氢气是人类未来最理想的燃料，以水为原料大量制取氢气的最理想的途径是A．利用太阳能直接使水分解产生氢气B．以焦炭和水制取水煤气(含CO和H2)后分离出氢气C．用铁和盐酸反应放出氢气D．由热电站提供电力电解水产生氢气