The country has experienced a population increase in the past 20 years. (替换划线部分词汇)

There is a rapid increase in population in that country that has caused a food (short)______.

The population of many Alaskan cities has __________ doubled in the past three years.

A、larger than
B、as great as
C、more than
D、as many as

There is a rapid increase in population in that country, which has caused a food ______ (short).

There has been a marked increase in industrial ____ during the past ten years.

A、

 output 

 breakthrough  

cutback