4. Sounds in complementary distribution must be allophones.

Allophones are described in phonetic terms

The allophones are either phonetically similar or in complementary distribution.

The initial sound of “peak” is aspirated while the second sound of “speak” is unaspirated. They are allophones.

The speech sounds which are in complementary distribution are definitely allophones of the same phoneme.

Phonetic similarity means that the allophones of a phoneme must bear some morphological resemblance.

The noun bear and verb bear are（） A: homophones B: homographs C: homonyms D: allophones

The noun “tear” and the verb “tear” are _____. A: homophones B: homographs C: complete homonyms D: allophones