单项选择题

Though customs vary from () to (), people across the world have learned to respect each other.

A. a country... a country
B. countries... countries
C. country... country
D. a country... another country

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单项选择题

Researchers have tried to identify the cause of SARS one way or (), there is, however, a long way to go.

A. other
B. another
C. the other
D. else

单项选择题

It is implied that ().

A. the cost of a degree in medicine is very high
B. higher education investment in medicine is not worthwhile
C. a student without family medical tradition is less likely to choose medicine
D. medicine is a field where every degree-holder can get a job