of the surface of the earth covered with water.
| A．Seven-tens. . . are | B．Seven-tens…is | C．Seven-tenths. . . is | D．Seven-tenths. . . are |
of the surface of the earth covered with water.
| A．Seven-tens. . . are | B．Seven-tens…is | C．Seven-tenths. . . is | D．Seven-tenths. . . are |
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