单选题 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.
【正确答案】 B
【答案解析】解析：考查形容词辨析。因为煤和石油越来越少，所以科学家就需要找到新的像太阳能、水能、风能等产生动力的替代类资源。alternative“供选择的，选择性的，交替的”，符合题意。primary“主要的”；instant“紧迫的”；unique“独一无二的”，均与题意不符。