单项选择题

The introduction of gunpowder gradually made the bow and arrow ______ , particularly in Western Europe.

A．obscure
B．obsolete
C．optional
D．overlapping
<上一题 目录 下一题>
热门 试题

单项选择题
The authors of the United States Constitution attempted to establish an effective national government while preserving ______ for the states and liberty for individuals.
A．autonomy
B．dignity
C．monopoly
D．stability
单项选择题
As an industry, biotechnology stands to ______ electronics in dollar volume and perhaps surpass it in social impact by 2020.
A．contend
B．contest
C．rival
D．strive
相关试题