单项选择题

Industrial (21) does not just happen. Companies (22) low accident rates plan their safety programs, work hard to organize them, and (23) working to keep them (24) and active. When the work is (25) done, a (26) of accident-free operations (27) established (28) time lost due to injuries is kept (29) a minimum.
Successful safety programs may (30) greatly in the emphasis placed (31) certain aspects of the program. Some place great emphasis on mechanical guarding. Others stress safe work practices by (32) rules or (33) . (34) others depend on an emotional appeal (35) the worker. But, there are certain basic ideas that must be used in every program if maximum results are to be obtained.
There can be no question about the value of a safety program. From a financial standpoint alone, safety (36) . The (37) the injury (38) , the better the workman’s insurance rate. This may mean the difference (39) operating at (40) or at a loss.
21().

A．are
B．is
C．was
D．were

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单项选择题

What is true about the application of Professor Morgan’s research().

A. It can be used to prolong everyone’s life.
B. It can help find cures for terminal illnesses.
C. It can cure cancer and Aids.
D. It can help freeze people with terminal illnesses and bring them back to life when the cure appears.

单项选择题

According to Professor Morgan, what enables animals to freeze themselves().

A. A certain chemical in their bodies.
B. The change of certain circumstances around them.
C. A certain temperature.
D. A certain season in the year.