She is an American，but she likes learning Chinese.She says Chinese is English.
A. as popular a language as
B. so popular a language as
C. as a popular language as
D. so a popular language as
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(答案→)A. as popular a language as
B. so popular a language as
C. as a popular language as
D. so a popular language as
解析：考查形容词的比较级形式。句意：她是一个美国人，但她喜欢学中文。她说汉语和英语一样受欢迎。此处表示同级比较且为肯定句，应用“as＋形容词原级＋a/an＋可数名词单数＋as”结构。
答案 A