单项选择题

Man in general does not appreciate what he has ______ he loses it.

A．after
B．until
C．before
D．when
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单项选择题
What the author think is the best way for children to learn things
A．By copying what other people do.
B．By making mistakes and having them corrected.
C．By listening to explanations from skilled people.
D．By asking a great many questions.
单项选择题
Exams, grades, and marks should be abolished because children's progress should only be estimated by ______.
A．educated persons
B．the children themselves
C．teachers
D．parents
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