4.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.
A、cool
B、flood
C、food
D、moon
After whom was the Amazon River named?
A、The Indian women fighters.
B、The head of an Indian trib
C、The first explorer of the river.
D、The women fighters in ancient Creek stories.
What did the writer think of his experience of learning to play chess?