单项选择题

Why has the return of Discovery been delayed for 24 hours

A．Because of mechanical faults aboard.
B．Because of unfinished work.
C．Because of the bad weather at the landing site.
D．Because of unknown reason.
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单项选择题
According to the professor, 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 fifteen minutes.
单项选择题
What has happened in Venezuela, according to the news
A．Serious car accident.
B．Plane crash.
C．Collision of trains.
D．Missing of a plane.
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