. As there is less and less coal and oil, scientists are exploring new ways of making use of ______ energy, such as sunlight, wind and water for power and fuel.

A．primary

B．alternative

C．instant

D．Unique

对乙酰氨基酚含有（）基，与三氯化铁发生呈色反应，可与利多卡因和醋氨苯砜区别。