单项选择题

A．Tourists.
B．Birds.
C．Winds.
D．Some animals.
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单项选择题
Slower population increase is largely responsible for the slight slowdown in the growth of the labor force.
A．Y
B．N
C．NG
单项选择题
A．Go through a health check.B．Carry little luggage.C．Arrive early for boarding.D．Undergo security checks.
A．Go through a health check.
B．Carry little luggage.
C．Arrive early for boarding.
D．Undergo security checks.
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