单项选择题

能进行产氧性光合作用的微生物是（    ）。    A.
古细菌    B.
蓝细菌    C.
放线菌    D.
细菌

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单项选择题

He will never be bullied into any change of his________. A. It was created mainly for scientific research B. It works better in fine weather conditions. C. It must be located on at least three satellites. D. Its service is free of charge.

多项选择题

22、生物质能源具有（）等特点，除了直接燃烧外，生物质还可以通过多种技术途径转化为固体、液体、气体燃料。

A.多样性
B.低污染
C.分布广
D.可再生