[单项选择]

What can be said of the normal process of aging, from a linguistic point of view In general (1) , there is a clear and (2) relationship: no-one would have much difficulty (3) a baby, a young child, a teenager, a middle-aged person, or a very old person from a tape recording. With children, (4) is possible for specialists in language development, and people experienced (5) child care, to make very detailed (6) about how language correlates with age in the early years. (7) is known about the patterns of linguistic change that affect older people. It is plain that our voice quality, vocabulary, and style alter (8) we grow older, but research (9) the nature of these changes is in its earliest stages. However. a certain amount of (10) is available about the production and (11) of spoken language by very old people, especially regarding the phonetic changes that take place.
Speech is (12) to be affecte
A. into
B. of
C. at
D. over

What can be said of the normal process of aging, from a linguistic point of view In general (1) , there is a clear and (2) relationship: no-one would have much difficulty (3) a baby, a young child, a teenager, a middle-aged person, or a very old person from a tape recording. With children, (4) is possible for specialists in language development, and people experienced (5) child care, to make very detailed (6) about how language correlates with age in the early years. (7) is known about the patterns of linguistic change that affect older people. It is plain that our voice quality, vocabulary, and style alter (8) we grow older, but research (9) the nature of these changes is in its earliest stages. However. a certain amount of (10) is available about the production and (11) of spoken language by very old people, especially regarding the phonetic changes that take place.
Speech is (12) to be affecte
A. speech
B. terms
C. ways
D. cases