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
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
单项选择题
The writer feels that nowadays a customer is ______.
A．the recipient of privileged treatment
B．unworthy of proper consideration
C．classified by society as inferior
D．the victim of modern organizations
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