题目

读短文，完成下面习题。There are four people in my family. My grandfather is sixty years old. He likes reading newspapers every day. He says, I can learn something from newspapers. I can know many people from newspapers. He also likes watching TV.My father and mother work in the hospital. They are very busy. They don't have time to read newspapers. They use smart-phones to know news and read books. They say, Smart-phones（智能手机）are very useful（有用的）. You can know what happens（发生）.I am Mike. I am a student. I like computers. I love news and many stars on the此视野在高倍显微镜下才能观察到，当把低倍镜换成高倍镜后，需要调节遮光器和反光镜，使得（　　） A、光圈变大，视野变暗B、光圈变小，视野变亮C、光圈变大，视野变亮D、光圈变小，视野变暗