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．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

A．to point out the advantages of an analytical approach
B．to point out that language learning strategies can be identified
C．to point out that different learners learn differently
D．to point out the uniqueness of language learning situations