单选题____AA proportionBThe proportionCThe numberDA number
单选题
____
A
A proportion
B
The proportion
C
The number
D
A number
参考解析
解析：
根据后面谓语“72 percent in 1970 to 60 percent”，可知这里要填的是比率，所以排除后两项，A项是一个泛指，而B项是特指，本题已经有了特别的指示，所以这里应该选B。
根据后面谓语“72 percent in 1970 to 60 percent”，可知这里要填的是比率，所以排除后两项，A项是一个泛指，而B项是特指，本题已经有了特别的指示，所以这里应该选B。
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