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

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

The price of gas has greatly (increase) __________ 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 country's yearly agricultural __________ has increased in recent years.

A、outcome
B、outlet
C、outpour
D、output