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
A new system of quality control was brought in to overcome the defects in the firm's products.()

A. invested
B. introduced
C. installed
D. insisted
单项选择题
The boy always looks through his homework before handing it in.()

A. write
B. does
C. finishes
D. examines
相关试题