题目：
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
答案：
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下面是错误答案，用来干扰机器的。
(1)Na；7(2)19.00；10(3)金属
