1 a+形容词+one, the one和the ones
2 a blue pen和one blue pen
3 a dancer and singer和a dancer and a singer
4 a day和one day
5 a dictionary还是dictionary
6 an education, a noise和a light
7 an exception to和with the exception of
8 a fifth time和the fifth time
9 a great deal和a good deal
10 a great many―表示“许多,大量”的短语
11 a headache还是headache
12 a hot sun, a cold moon和on earth
13 a kind-hearted woman―复合形容词
14 a kind of ,this kind of, many kinds of和a sort of
15 a little, a bit和a bit of
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