Question

prefixes
the prefix \mid\ means \middle\.
because of the impending storm above, the pilot kept the
plane at mid - altitude to avoid turbulence.
which is most likely the meaning of the underlined
word?
above altitude
middle altitude
on the ground
not quite to altitude

Explanation:

The prefix "mid" means "middle". So, "mid - altitude" should mean "middle altitude".

Answer:

Middle altitude