想一想,写出汉字。
鱼要见水____,水少要露____。
I sent a big bunch of flowers to the nurse as an ________ of thanks for her taking good care of my grandpa in the nursing home. ( )
图为冬天时,女孩通过哈气取暖,男孩通过搓手取暖,这两名儿童的取暖方式分别是( )
超声波是人耳听不见的声音,但它有着广泛的应用。在下列设备中,利用超声波工作的是 ( )