There is in population that a food shortage is caused.
A. so rapid an increase
B. such rapid an increase
C. such rapid increase
D. so a rapid increase
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(答案→)A. so rapid an increase
B. such rapid an increase
C. such rapid increase
D. so a rapid increase
解析：这题考查so、such的区别，so+adj+a/an+名词，such+a/an+adj+名词，句意是:人口增长是如此快以至于食品短缺也造成了。选A。