Which of the following is closest in meaning to “sitting on the sidelines” in Para. 3?
A、Not being notice
B、Expressing vague ideas.
C、Not being involve
D、Following what others do.
How does exercise help the elderly?
A、By improving attention.
B、By slowing memory loss.
C、By connecting with others.
D、By controlling cell growth.
2. 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.