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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

56.

How does exercise sharpen the mind according to Para.2?

• A、By increasing the brain siz

• B、By decreasing the protein level.

• C、By extending the time of concentration.

• D、By strengthening brain cells’ connections.