The earth is often called the ocean planet． Its surface is 70 percent ________． （ ）
| A． |
land |
B． |
plants |
C． |
animals |
D． |
water |
The earth is often called the ocean planet． Its surface is 70 percent ________． （ ）
| A． |
land |
B． |
plants |
C． |
animals |
D． |
water |
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