单项选择题

There was only about five minutes__________ of the lecture.

A．leaving
B．left
C．having left
D．having been left
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单项选择题
From the last sentence of the passage we can infer that __________.
A．We still lack a full understanding of our own biological clock.
B．Our own biological clock is a lot different from that of a mouse.
C．We have already known much about the circadian rhythms of mammals.
D．There is still a lot to be done before your own biological clock will tell you the time.
单项选择题
Public opinion was deeply __________ over the project.
A．different
B．disagreed
C．disagreeable
D．divided
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