单项选择题

For how long can a reader keep the book before he renews it

A．One week.
B．One month.
C．Two weeks.
D．Two months.
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单项选择题
Recently, people more concern about _________.
A．the housing shortage and the housing deprivation in Belgium
B．the deterioration of housing conditions
C．the government’’s macroeconomic and microeconomic policies
D．how to buy their own houses by the aid of the government
单项选择题
It can be inferred from the passage that scientists are currently making efforts to observe which of the following events
A．The decay of a vacuum in the presence of virtual particles.
B．The decay of a vacuum next to a super heavy atomic nucleus.
C．The creation of a superheavy atomic nucleus next to an intense electric field.
D．The creation of a virtual electron and a virtual positron as a result of fluctuations of a vacuum.
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