单项选择题

The grapes are harvested on a date that

A．may vary.
B．is traditionally set.
C．depends on the official approval.
D．is determined by availability of pickers.
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In the author's opinion, Bernstein's Young People's Concerts were
A．revelatory.
B．enervating.
C．compulsory.
D．daunting.
单项选择题
The early warning systems developed in the 1990's are used to
A．improve estimates of long-term earthquake probabilities.
B．tell people in the epicenter when the earthquake will come.
C．allow evacuation from the region that the earthquake will hit.
D．prepare people for earthquakes several minutes in advance.
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