单项选择题

A．moreover
B．however
C．therefore
D．nevertheless
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单项选择题
Although of course there are exceptions, it seems reasonably clear that in certain countries—Rwanda, Somalia and parts of the former Yugoslavia come to mind—hunger is less a result of an absolute food shortage, ______ a policy decision or the political situation.
A．than of
B．rather than
C．but the result of
D．than is
单项选择题
According to this passage, research in this area is characterized as ______.
A．empirically observable
B．often impossible to observe directly
C．poorly defined in the research literature to date
D．easier to theorize about than to carry out directly
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