单项选择题

With the pace of change quickening, more and more scientists find it hard to keep up with the latest developments even in their own ______.

A. disciplines
B. institutes
C. perspective
D. horizon
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单项选择题
All experts agree that the most important consideration with diet drugs is carefully ______ the risks and benefits.
A. weighing
B. valuing
C. evaluating
D. distinguishing
单项选择题
An earthquake of 8-______ struck some parts of this province, causing a death toll of over 30,000.
A. altitude
B. aptitude
C. magnitude
D. gratitude
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