答案：D
句意：汽車的聲音消失在遠(yuǎn)方.
die down
1.(植物)枯萎,凋謝(但根仍可活),(過(guò)冬時(shí))假死,頂(梢枯)死,回枯：
The dahlias died down when we had the first cold spell.
第一次寒潮襲來(lái)時(shí),大麗花的枝葉枯萎而假死了.
2.逐漸平息,漸漸停止,逐漸消失,變?nèi)酰?br/>The wind has died down quite a lot.
風(fēng)小多了.
The fire is dying down.
火要熄了
die out
1.滅絕,死光,不復(fù)存在：
Many species of animals are in danger of dying out.
許多動(dòng)物種類都處于瀕臨滅絕的危險(xiǎn)中.
2.逐漸消失；漸漸停息：
Gradually the roar died out and the night became quiet.
吼聲漸漸停息,夜晚變得寂靜.
die off
相繼死去,一個(gè)個(gè)死掉；絕種；順次枯死；(聲音等)逐漸消失：
The refugees were dying off from disease.
難民們相繼因病喪身.
The species is dying off.
該物種面臨絕種.
die away
1.(尤指聲音、風(fēng)、雨、光亮、勢(shì)力、活動(dòng)等)漸漸消失,逐漸消逝(或減弱,平息),逐漸停止：
His anger died away.
他的怒氣逐漸平息下來(lái)了.
The laughter died away.
笑聲漸漸消失了.
2.褪去；衰萎；漸漸凋落：
The rosy colour of her cheeks has died away.
她粉紅色的雙頰已漸衰萎.
3.失去知覺(jué)；昏絕：
She died away at the sight.
她一看到這情況就昏過(guò)去了.
4.【建筑學(xué)】銜接：
The arch died away against the towers.
弓形結(jié)構(gòu)與塔狀結(jié)構(gòu)相銜接.請(qǐng)問(wèn)die away和die down的區(qū)別，我混淆了。好像都有“消失，變?nèi)酢钡囊馑肌Ｖx謝！die away1. (尤指聲音、風(fēng)、雨、光亮、勢(shì)力、活動(dòng)等)漸漸消失，逐漸消逝(或減弱，平息)，逐漸停止：His anger died away.他的怒氣逐漸平息下來(lái)了。The laughter died away.笑聲漸漸消失了。2. 逐漸平息，漸漸停止，逐漸消失，變?nèi)酰篢he wind has died down quite a lot.風(fēng)小多了。The fire is dying down.火要熄了你多多看看這個(gè)兩個(gè)例句，其實(shí)他們的區(qū)別就應(yīng)該知道了。你是聰明人，你懂的！