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
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单项选择题
The disappearance of old style hotel porters can be attributed to the fact that ______.
A．few people are willing to do this type of work
B．machines are more reliable than human beings
C．the personal touch is appreciated less nowadays
D．automation has provided cheaper alternatives
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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