单项选择题

A．No one knows exactly how silk was made.
B．No one knows exactly when silk was made.
C．The history of the silk is a fascinating story.
D．The Chinese people kept the secret of how to make silk for as long as 4,000 years.
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单项选择题
A．It breaks down easily.B．It has an annoying noise while playing.C．It has no bass.D．It can’t have surround effects.
A．It breaks down easily.
B．It has an annoying noise while playing.
C．It has no bass.
D．It can’t have surround effects.
单项选择题
A．It kept the 12,000 journalists up-to-date on the results.B．It helped journalists know the judges’ final decision within a minute’s time.C．It allowed the traffic controllers to relay traffic reports more efficiently.D．It helped the journalists in identifying their weaknesses and suggesting ways to improve
A．It kept the 12,000 journalists up-to-date on the results.
B．It helped journalists know the judges’ final decision within a minute’s time.
C．It allowed the traffic controllers to relay traffic reports more efficiently.
D．It helped the journalists in identifying their weaknesses and suggesting ways to improve
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