已知直角三角形中一个锐角为30°，则另一个锐角为（ ）
人看到水池里的月亮和鱼的像，它们的形成分别是哪一种现象（ ）
— He plans to give a speech to raise food and clothes for the disabled next month.
— That’s great. I also want to help those children_________.
