单项选择题

What does the word "precursor" in the context in Para. 3 mean

A．A man that may come before the happening of an earthquake.
B．The leading actor that may cause a series of events to occur.
C．An meaningful sign that indicates some would-be happenings.
D．An event that may have symbolic or significant nature.

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单项选择题

One of the chief difficulties in accurate earthquake warning is that ______.

A．earthquakes may take place in anywhere possible.
B．earthquakes may happen at any unexpected moment.
C．most earthquakes take place simultaneously and unexpectedly.
D．the occurrence of earthquakes involves too many unforeseen factors.

单项选择题

The cut-off point for the survey in part. 1 refers to______.

A．146 billion—the collective worth of the country's richest 1,000 people.
B．January—the deadline for the survey.
C．31million—the increase of wealth in just 12 month.
D．160 billion—the total valve of the wealth of richest 1,000.