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.
A、there
B、thick
C、thank
D、thirty
There are numerous websites on the Internet ____ you can learn how to cook.
A、that
B、when
C、where
D、which
What did the writer think of his experience of learning to play chess?