单项选择题

A．They traveled around there.
B．They taught English there.
C．They did geological research there.
D．They served as volunteer workers there.
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单项选择题
Kellaris has studied the effects of music on consumers for over 12 years.
A．Y
B．N
C．NG
单项选择题
A．To simplify the registration process of these enterprises.B．To reduce the tax rate of these enterprises.C．To reduce the cost of starting an enterprise and conducting R&D.D．To train employees for these enterprises.
A．To simplify the registration process of these enterprises.
B．To reduce the tax rate of these enterprises.
C．To reduce the cost of starting an enterprise and conducting R&D.
D．To train employees for these enterprises.
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