单选题 Why does the rocket ______ those long streams of flame and smoke?
【正确答案】 C
【答案解析】解析:emit vt.散发,发射(如:Boiling water emits steam.Fire flies emit light but not heat.)。throw vt.扔,抛,投。omit vt.省略,删节;遗漏,疏忽。transmit vt.播送,发射;传送,传递,输送。