题目

    The baby is just one day old and has not yet left hospital. She is quiet but alert (警觉)。Twenty centimeters from her face researchers have placed a white card with two black spots on it. She stares at it carefully. A researcher removes the card and replaces it by another, this time with the spots differently spaced. As the cards change from one to the other, her gaze(凝视) starts to lose its focus - until a third, with three black spots, is presented. Her gaze returns: she looks at it for twice as long as she did at the previous card. Can she tell that the number two is di小明同学学习了“练习使用显微镜”之后，用显微镜观察某种植物叶肉细胞的结构。下图为显微镜结构示意图，根据图回答问题。（1）显微镜的结构中起放大作用的是[ ]和[]。（2）在光线较暗的环境中进行对光时，应使用反光镜的面。（3）在低倍显微镜下，使镜筒上升或下降需要转动[] ， 如果想获得更清晰的视野，需要调节[]。（4）观察玻片标本时，玻片标本应放在[]上，用压片夹压住，玻片标本要正对的中心。（5）这台显微镜备有两种目镜5×和10×，两种物镜10×和40×，使用这台显微镜观察，若想看到最多细胞应放大倍。