题目：
There has been an i
ncrease in the technical cooperation and cultural________ between China and
other countries in the past ten years.[ ]
A. change
B. trade
C. bargain
D. exchange
答案：
答案：D
There has been an increase in the technical cooperation and cultural________ between China and
other countries in the past ten years.[ ]
A. change
B. trade
C. bargain
D. exchange
答案：D
