Questions 21 and 22 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions.
In the firefight ______ Hamas militants were killed.

A．does the work of making maps.
B．is quite familiar with the city’s routes.
C．is a geographic specialist.
D．knows more than a computerized map.

A．disease.
B．virus.
C．blood type.
D．cancer.