单项选择题

Which of the following is the length of lectures or seminars or tutorials

A．1 hour.
B．2 hours.
C．3 hours.
D．15 hours.
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单项选择题
According to the passage, science and engineering courses seem to be more ________than arts courses.
A．motivating
B．varied
C．demanding
D．interesting
单项选择题
Animals that could not_________ themselves to the changed environment perished and those that could survived.
A．change
B．adapt
C．modify
D．conform
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