各自然带沿着南北方向作有规律的更替，这种现象称为（　　）

用吸管吸取一些墨汁慢慢滴在鱼口前方，墨汁会流向并进入鱼口，请问，很快可以看见这些墨汁会从下列哪个地方流出（    ）

对比人的眼球结构和照相机，眼球中的____相当于照相机镜头，____相当于光圈，____相当于胶卷.

—Most people said the film Let The Bullets Fly was wonderful _____ they watched it.
—I agree with them, and I like it very much!