The old man's clothes, ____ old and worn, looked clean and of good quality.
A、if
B、when
C、though
D、since
What is the main idea of the passage?
A、Exercise strengthens people's body
B、Exercise helps babies to grow.
C、Exercise improves people' s lif
D、Exercise benefits the brain.
3.In each of the following groups of words, there are four underlined letters or letter combinations marked A, B, C and D. Compare the underlined parts and identify the one that is different from the others in pronunciation.