题目

如图所示，小丽同学将一个凸透镜正对太阳光，再把一张纸放在它的另一侧，改变透镜与纸的距离，直到纸上出现一个最小、最亮的光斑。这表明凸透镜对光线有作用，光斑到凸透镜的距离就是凸透镜的。 答案：【1】会聚【2】焦距The weather yesterday was              it is today. [     ]A. not as wetter as B. much wetter than C. more wetter than D. wetter as