单项选择题

The most crucial problem any economic system faces is how to use its scarce resources.

A. puzzling

B. difficult
C. terrifying

D. urgent
<上一题 目录 下一题>
热门 试题

单项选择题
Safety is always our primary concern.
A. least
B. secondary
C. last
D. chief
单项选择题
If the weatherman has predicted accurately, tomorrow will be a perfect day for our picnic.
A．astutely
B．correctly
C．carefully
D．acutely
相关试题