单项选择题

A．Such strikes are against the British law.
B．Such strikes are unpredictable.
C．Such strikes involve workers from different trades.
D．Such strikes occur frequently these days.
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单项选择题
A．They shine brightly.B．They are extremely strong.C．They can store and release heat.D．They can absorb water.
A．They shine brightly.
B．They are extremely strong.
C．They can store and release heat.
D．They can absorb water.
填空题
Tourism industry __________ for 200 million people worldwide.
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