[单选题]腐蚀品按其酸碱性大小可分为( )类
A. 一
B.二
C. 三
D.四

There are great impediments to the general use of a standard
in pronunciation comparable to that existing in spelling
(orthography). One is the fact that pronunciation is learnt
'naturally' and consciously, and orthography is learnt （1）
deliberately and consciously. Large numbers of us, in fact,
remain throughout our lives quite unconscious with what （2）
our speech sounds like when we speak out, and it often（3）
comes as a shock when we firstly hear a recording of ourselves. （4）
It is not a voice we recognize at once, whereas our own handwriting
is something which we almost always know. We begin the "natural' （5）
learning of pronunciation long before we start learning to read or
write, and in our early years we went on unconsciously imitating and （6）
practicing the pronunciation of those around us for many more hours
per every day than we ever have to spend lear

For a wrong word, underline the wrong word and write the correct one in the blank provided
at the end of the line.
For a missing word, mark the position of the missing word with a "∧" sign and write the word
you believe to be missing in the blank provided at the end of the line.
For an unnecessary word, cross the unnecessary word with a slash "—" and put the word in the blank
provided at the end of the line.

The desire to use language as a sign of national identity
is a very natural one, and in result language has played a (1) ______
prominent part in national moves. Men have often felt the (2) ______
need to cultivate a given language to show that they are
distinctive from another race whose hegemony they resent. (3) ______
At the time the United States split off from Britain, for (4) ______
example, there were proposals that independence shou