‍ The organs that take part in production of speech sounds are called __________‍ A: speech production B: pharyngeal cavity C: nasal cavity D: speech organs

无脊椎的脊索动物具有的典型生物特征包括 A: 脊索(Notochord) B: 鳃裂(Pharyngeal slits) C: 神经索(Nerve cord) D: 后尾(Post-anal tail)

The food mass descends into the oropharyngeal canal, where it is prevented from entering the larynx by the pharyngeal muscles, which cause the epiglottis to cover the larynx. A: 食物团进入口咽管内，并且阻止喉内的咽喉肌肉通过食物。 B: 食物团进入口咽管内，咽部肌肉会盖住喉部以阻止食物团进入喉内。