单项选择题

______ relatively costly, the diesel engine is highly efficient and needs servicing infrequently.

A．Even
B．It is
C．Even though
D．There is
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单项选择题
Essentially, a theory is an abstract, symbolic representation of ______ reality.
A．what it is conceived
B．that is conceived
C．what is conceived to be
D．that is being conceived of
单项选择题
People s expectations for a higher standard of living increase ______.
A．conditions in their community
B．since conditions in their improving
C．conditions in their community improve
D．as conditions in their community improve
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