单项选择题

Which of the following would NOT cause a sea cucumber to release its internal organs into the water

A．touch.
B．Food.
C．Unusually warm water.
D．Pollution.
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单项选择题
The fourth paragraph of the passage primarily discusses ______.
A．the reproduction of sea cucumbers
B．the food sources of sea cucumbers
C．the eating habits of sea cucumbers
D．threats to sea cucumbers' existence
单项选择题
Service organizations claim that keeping checkout counters manned would result in ______.
A．a rise in the price for providing services
B．demands by cashiers for more money
C．insignificant benefits for the customers
D．the need to purchase expensive equipment
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