在太空中，宇航员处于失重状态，以下实验不能做的是（　　）

选词填空。

    Deng Feng is my friend．He is____and interested in music．He usually gets up at 6：00 in the morning and then he does some____in the park．He likes to listen to____music When exercising．Before going to bed，he listens to some____of light music．Sometimes he'd like to enjoy traditional Chinese music．He____it's a good way to relax．Some day,he will study music and be a musician．

人的眼睛好像一架照相机，它的晶状体和角膜共同作用相当于一个____ ，它能把来自物体的光____ （选填“会聚”或“发散”）在视网膜上，形成物体的____ （选填“实”或“虚”）像。