글의 흐름상 가장 어색한 문장은? Progress is gradually being made in the fight against cancer.

Question

Accepted Answer

3. It has been proven that smoking is a direct cause of lung cancer.

Answer

In the early 1900s, few cancer patients had any hope of long-term survival.

Answer

But because of advances in medical technology, progress has been made so that currently four in ten cancer patients survive.

Answer

It has been proven that smoking is a direct cause of lung cancer.

Answer

However, the battle has not yet been won. Although cures for some forms of cancer have been discovered, other forms of cancer are still increasing.