单项选择题

A．An English book.
B．A Chinese book.
C．A chemistry book.
D．A medical book.
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单项选择题
Repetition in language learning is important, according to Dr. Eliot.
A．Y
B．N
C．NG
单项选择题
According to the author, why do some companies suffer from reactive, opportunistic and slow product development
A．They do not consult the experts.
B．They develop cycle is too slow.
C．They do not response to the market.
D．They do not have a strategic approach.
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