单项选择题

As used in the first paragraph, the phrase "by trial and error" means ______.

A．refer to others
B．by accident
C．consult teachers
D．through experiments
<上一题 目录 下一题>
热门 试题

单项选择题
What is the author's purpose of referring to Sam's broken bicycle
A．To illustrate the ways to repair his bicycle.
B．To discuss the problems of his bicycle.
C．To tell us how to solve a problem.
D．To show us how to analyze a problem.
单项选择题
In analyzing a problem we should do all the following EXCEPT ______.
A．recognize and define the problem
B．look for information to make the problem clearer
C．have suggestions for a possible solution
D．find a solution by trial and error
相关试题