It is said that the gravity on Mars is only about __________ of the gravity on earth．
| A．three-eighths | B．third-eighth |
| C．three-eighth | D．third-eighth |
It is said that the gravity on Mars is only about __________ of the gravity on earth．
| A．three-eighths | B．third-eighth |
| C．three-eighth | D．third-eighth |
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