单项选择题

The language experts believe that the （）age for learning a foreign language is 6 years old.

A. conceptual
B. considerate
C. optimal
D. component

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单项选择题

Contradictory to popular belief, recent surveys show that besides housewives, many college students are also（）to soap operas．

A．appealed
B．addicted
C．adjusted
D．attracted

单项选择题

During their first teacher training year, the students often visited schools for the（）of lessons.

A. observation
B. investigation
C. inspection
D. examination

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