如果一国的国际储备能满足该国4个月的进口需要，则该国储备/进口比率是（）。
A.25%
B.33.3%
C.40%
D.50%
参考答案：B
一个数扩大100倍，再缩小1000倍是3.5，这个数是______．
The rate of racial progress varies in different areas of the country, but in the past ten years _________ more improvement.
A．there is
B．it is
C．there have been
D．there has been
