单项选择题

A．Boats were extremely crowded then.
B．The current was too swift for boats to cross easily.
C．Bridges were too weak to carry the weight of a carriage.
D．Ferry service was infrequent.
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单项选择题
A．It allows them to meet students from other universities. B．It allows more flexibility in students’ schedule. C．It promotes the concept of self-learning. D．It doesn’t require any examinations.
A．It allows them to meet students from other universities.
B．It allows more flexibility in students’ schedule.
C．It promotes the concept of self-learning.
D．It doesn’t require any examinations.
单项选择题
A．Two. B．Four. C．Five. D．Six.
A．Two.
B．Four.
C．Five.
D．Six.
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