单项选择题

Mobility is one of the characteristics often ______ executives, and they must accustom themselves to moving quite regularly.

A．demanded of
B．asked for
C．expected from
D．called for
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单项选择题
Malaria, it is true, has been practically ______ in thirteen countries, including the United States, and is under attack in many others.
A．wiped out
B．died out
C．put out
D．kept out
单项选择题
______ in the United States, St. Louis has now become the 24th largest city.
A．The fourth biggest city it was
B．Once the fourth biggest city
C．Being the fourth biggest city
D．It was once the fourth biggest city
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