As there is less and less coal and oil, scientists areexploring new ways of making use of______________energy, such as sunlight, wind and water for power and fuel.A．abrupt B．alternative C．authentic D．abstract B【解析】试题分析：考查形容词：

My father warned me _____going to the West Coast because it was crowded with tourists.

It is not rare in_____ that people in ______fifties are going to university for further education．

It was his word and action but not his appearance _______ moved us deeply.

It was _____ he came back from Africa that year _____ he met the girl he’d like to marry.