57.

What is the main idea of the passage?

• A、Exercise strengthens people's body

• B、Exercise helps babies to grow.

• C、Exercise improves people' s lif

• D、Exercise benefits the brain.

Which of the following can turn customers’ attention into real interest?

• A、Listing the product's main features.

• B、Describing the benefits of a product

• C、Selling a product at a great discount.

• D、Offering free samples through a link