单项选择题

A．They want to benefit from general English skill.
B．They don’t want to change their professional life.
C．They want to have an up-to-date knowledge of English.
D．They know clearly what they want to learn.
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单项选择题
A．A product launch that didn’t succeed.B．A new idea that became a commercial success.C．A manufacturing problem.D．A new design of the bicycle helmet.
A．A product launch that didn’t succeed.
B．A new idea that became a commercial success.
C．A manufacturing problem.
D．A new design of the bicycle helmet.
填空题
involve
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