单项选择题

A．They are doing experiments.
B．They are listening to the lecture.
C．They are debating.
D．They are giving and listening to presentations.
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单项选择题
A．Because there was a traffic jam.B．Because he got up late.C．Because his apartment is far away from the campus.D．Because he missed a bus and had to wait for another one.
A．Because there was a traffic jam.
B．Because he got up late.
C．Because his apartment is far away from the campus.
D．Because he missed a bus and had to wait for another one.
单项选择题
A．15 minutes.B．30 minutes.C．20 minutes.D．25 minutes.
A．15 minutes.
B．30 minutes.
C．20 minutes.
D．25 minutes.
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