单项选择题

The microscope enables scientists to distinguish an incredible number and variety of bacteria.

A. unavoidable
B. unchangeable
C. unbelievable
D. unpredictable
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单项选择题
Thus the most logical approach is to focus our analysis on the trade relations of Spain with other European countries.
A. reasoning
B. conclusion
C. position
D. method
单项选择题
The police tried in vain to break up the protest crowds in front of the government building.
A. unskillfully
B. violently
C. ineffectively
D. eventually
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