Things are ________ on Mars ________ on Earth because of the different gravity.
| A．much lighter; than that |
| B．much lighter; than those |
| C．not so light; as that |
| D．not so light; as those |
Things are ________ on Mars ________ on Earth because of the different gravity.
| A．much lighter; than that |
| B．much lighter; than those |
| C．not so light; as that |
| D．not so light; as those |
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