51. Population growth and pollution place enormous ______ on the world’s supply of usable water. A. stress B. exposure C. endurance D.endeavor - 自考题库

51. Population growth and pollution place enormous ______ on the world’s supply of usable water. A. stress B. exposure C. endurance D.endeavor

出自：郑州工程技术学院-大学英语（2）.

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