Final answer:
Covering an ice cube and thread with a layer of salt causes the ice to melt and then quickly refreeze around the thread, making it possible to lift the ice cube by the thread, confirming the statement as true.
Step-by-step explanation:
The statement is true. When you cover an ice cube and thread with a layer of salt, the salt causes the ice to melt at a rate faster than it would naturally due to freezing point depression.
However, because the cup is at a temperature that is still generally below freezing, the melted water around the thread quickly refreezes, effectively sticking the thread to the ice cube.
This phenomenon allows you to lift the ice cube by picking up the thread after the salt has done its work and the water has refrozen.