题目

Not believing their eyes, the visitors on the spot_______ the flying plane, doing some most difficult and dangerous tricks in the sky.     A. glared at           B. stared at          C. glanced at          D. caught sight of   答案：B植物叶肉细胞中的能量转换器是A. 线粒体 B. 叶绿体C. 细胞核 D. 线粒体和叶绿体