Question

The Colosseum in Rome, Italy is a model of enduring architecture. Visitors from all over the world come to admire the improbable structure, which has been preserved since around 70 AD. But the stone structure isn't the only thing that has lasted over the years: the Colosseum is also home to a wealth of plant species. In fact, a study in 1855 revealed as many as 420 plant species growing in and around the stone structure.
Because plants can erode stone over time, some people consider the Colosseum's vegetation to be unwelcome. In 1871, attempts were made to remove plant species from the area. The plants, however, have proven to be uncooperative: today more than 200 species still remain.
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Visitors from all over the world come to admire the improbable structure, which has been preserved since around 70 AD.

What is the denotative meaning of improbable?
A.
crumbling from age
B.
marked by difficulty
C.
extremely well-built
D.
unlikely to be true

Answer 1

D. unlikely to be true

Explanation: "Improbable" denotatively means unlikely to happen or be true; here it describes how surprising or unlikely it is that the structure has been preserved since around 70 AD.