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
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单项选择题
According to the article, a good student in college must also__________.
A．know the answer to every quiz question
B．answer only interesting questions
C．know the answer to every question the teacher asks
D．know the answers to a lot of quiz questions but maybe not the hardest ones
单项选择题
Furnell students usually have__________.
A．announcements to make in class
B．a lot of free time
C．a lot of work and not much time
D．perfect quiz scores
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