单选题 Einstein's photoelectric theory then ______ scientists' appreciation of TV principles. But for his epoch-making theory, other scientists would have spent more years groping for it.
A. threw light on B. gave rise to
C. led the way to D. brought into effect

【正确答案】 A

【答案解析】throw light on“使明白”；give rise to“引起；导致”；lead the way to“带路；引向”；bring into effect“使实施”。题句意为：“爱因斯坦的光电理论使科学家懂得正确评价电视原理，若不是他的划时代的理论，其他科学家们还得花费许多年进行摸索。”