_海南成考网

What can be learned from the study?

• A、Cats take food no matter who feeds them.

• B、Cats refuse food from unhelpful strangers.

• C、Dogs refuse food from those who anger them.

• D、Dogs take food no matter how they are treate

58.

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.