单项选择题

A．150 million
B．1.50 million
C．15 million
D．50 million
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单项选择题
Which of the following is not a character of acquisition
A．use textbook.
B．conducted with no careful schedules
C．learn language subconsciously
D．concentrate on meaning
单项选择题
The United States bought Louisiana from______
A．France
B．Spain
C．Britain
D．Mexico
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