单项选择题

______ man can now create radioactive elements, there is nothing he can do to reduce their radioactivity.

A. As
B. Whether
C. While
D. Now that
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单项选择题
Doctors are often caught in a ______ because they have to decide whether they should tell their patients the truth or not.
A. puzzle
B. perplexity
C. dilemma
D. bewilderment
单项选择题
The town maintains many Chinese traditions which are among the highest achievements of those who created the cultural ______ we now enjoy.
A. heritage
B. genetics
C. inheritance
D. estate
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