单项选择题

According to the passage, a teacher' s duty is to______.

A．providing students with help when necessary
B．finding out students' mistakes and correcting them
C．teaching students the essential knowledge that they will need in their future life
D．telling students the correct answers
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单项选择题
What does the author think is the best way for children to learn things
A．By making mistakes and having them pointed out by others.
B．By having their mistakes corrected.
C．By noticing their problems and making changes.
D．By listening to explanations from skilled people.
单项选择题
Which of the following is an example of telecommuting as described in the passage
A．A scientist in a laboratory developing plans for a space station.
B．A technical writer sending via computer documents created at home.
C．A computer technician repairing an office computer network.
D．A teacher directing computer to assist learning in a private school.
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