已知某房地产价格为900元/m2时，需求量为100×104m2，当价格为1000元/m2时，需求量为90×104m2，则需求价格弹性为( )。
A. 10
B. 9
C. 0.9
D. 0.1
下列______最能说明洋务运动迈出了中国近代化的第一步。
A. 举办新式学堂，派遣留学生
B. 清政府中央机构的变动
C. 建立近代化的海军
D. 引进西方先进技术
The language of uncivilized groups as compared to Western languages are limited in ______.
A. sound patterns
B. vocabularies
C. grammatical structures
D. both B and C
The article states that grunt-and-groan forms of speech are found ______.
A. nowhere today
B. among the Australian aboriginals
C. among Eastern cultures
D. among people speaking "backward" languages
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