单项选择题

Recent studies have shown that the stature of male Americans has scarcely changed in the past two hundred years.

A. weight
B. height
C. life span
D. head size
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It has taken many years to adopt internationally recognized standards for the licensing of aircraft pilots.
A. data
B. criteria
C. committees
D. flags
单项选择题
The trumpet was part of the opera orchestra long before it became a standard orchestral instrument.
A. major
B. tuneful
C. desirable
D. regular
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