If two speech sounds are in contrastive distribution, they _____

If two speech sounds are in contrastive distribution, they ______. ()
A、represent two phonemes
B、are allophones of the same phoneme
C、have exactly the same phonetic features
D、do not appear in the same environment
【正确答案】：A
【题目解析】：(P35):语音上相似的声音可能有两种相联系的方式。如果是两个不同的音位,它们就构成意义上的对比;如果是同一个音位的音位变体的话,那么它们在意义上就不构成对比。