57.

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.

• A、useless
• B、endless
• C、unless
• D、hopeless

What does most research about cats show?

• A、They don't need their owners’ attention.

• B、They are emotionally attached to their owners.

• C、They don't experience separation anxiety as dogs do.

• D、They respond to their owners’ voices less than dogs do.