单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．Pollution problem.
B．Population problem.
C．Unemployment problem.
D．Nuclear weapon problem.
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单项选择题
______ makes a 98.5% reduction in man-days on unloading the ship.
A．Containerization
B．Productivity
C．Competition
D．Management
单项选择题
A．He arrived at the theater late.B．He left his watch in the theater.C．The production seemed much shorter than it actually was.D．He did not enjoy the production.
A．He arrived at the theater late.
B．He left his watch in the theater.
C．The production seemed much shorter than it actually was.
D．He did not enjoy the production.
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