单项选择题

Weather observations come from all the sources EXCEPT ______ .

A．computers
B．satellites
C．the ground
D．radar
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单项选择题
According to the speaker, what can a speaker do to keep an audience’s attention
A．Speak very loudly.
B．Ask questions frequently.
C．Vary tone, volume and speed of speech.
D．Limit the speech to a short one.
单项选择题
What does the speaker suggest that students who have bad colds do
A．Take plenty of medicine.
B．Call up the doctor.
C．Come to the clinic.
D．Get proper exercise.
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