单项选择题

The aim of the U.S. government in imposing rent controls on American cities in 1943 was to help ______.

A．workers and the families of soldiers
B．low-income families
C．up-middle-income families
D．high-income families
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单项选择题
It can be inferred from the passage that rent controls ______.
A．seems unable to control high rents
B．is successful
C．is favoured by builders and landlords
D．will be cancelled
单项选择题
Pure science, leading to the construction of a microscope, ______.
A．may lead to antiscientific, "impure" results
B．necessarily precedes applied science, leading to the discovery of a cell
C．is not always as pure as we suppose
D．necessarily results from applied science and the discovery of a cell
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