45[单选题,1.3分] The concentration of populations in cities has given ______ to many problems of housing, education, and medical services. A. rise B.reason C. result D.response

45[单选题,1.3分] The concentration of populations in cities has given ______ to many problems of housing, education, and medical services.
A. rise
B.reason
C. result
D.response

出自：河南大学-本科英语

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