问题
选择题
Although about ______ of the earth is covered with water, only a very small amount of it is drinkable. [ ]
A. seven-tenth
B. seven tenths
C. seven-tenths
D. seven-tens
答案
答案：B
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Although about ______ of the earth is covered with water, only a very small amount of it is drinkable. [ ]
A. seven-tenth
B. seven tenths
C. seven-tenths
D. seven-tens
答案：B