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.

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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.

单项选择题

Why does the author call the wealth of the riches paper fortunes

A．Because their wealth is mainly generated from technology shares.
B．Because their wealth can be easily lost.
C．Because their wealth is greatly influenced by start-up companies.
D．Because their wealth is quickly devaluated with the up-to-down of house prices.