The country's yearly agricultural __________ has increased in recent years.

The _____ of traffic on the roads has increased dramatically in recent years.

A、

amount

total

summary

volume意思是“量”，The volume of traffic意思就是：交通量，符合题意。

The ________ of home computers has increased greatly in recent years.

The ____________ of smart phones has increased greatly in recent years.

A、popularity
B、familiarity
C、population
D、explanation

__________has been the U.S. largest food and agricultural state for nearly 50 years.