试题详情

The number of these families has ________ by 40 percent in the past ten years.

The sales of private cars have increased 40 percent in the past ten years.

al shift in the structure of the American economy.The gap between the rich and the poor has widened

Beijing has cut its birth-rate _almost 60 percent in the past 20 years.

____(13)ten years.In the 1970s,the five-year survival rate for children was about 50%.In the 1960s,m