World food output per head has risen by 4 per cent between the 1970s and 1980s mainly ______ a result of increases in yields fro

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问题 World food output per head has risen by 4 per cent between the 1970s and 1980s mainly ______ a result of increases in yields from land already in cultivation.

选项 A、with
B、for
C、as
D、to

答案C

解析 固定搭配题。短语as a result of表示“因为”,with the result that...表示“相伴而生的结果是……”,根据句意,可知C正确。
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