问题
选择题
The population of Africa is ________ so rapidly as to cause concern of the whole world. [ ]
A. expanding
B. circulating
C. exporting
D. spreading
答案
答案：A
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The population of Africa is ________ so rapidly as to cause concern of the whole world. [ ]
A. expanding
B. circulating
C. exporting
D. spreading
答案：A