Kellie and Louis Nicolao have a dog. Its name is Moose. One day, they took Moose to Nicolina Converso’s house in Edgewater, Maryland.

Everything was going great before the morning of Dec. 23. That day, Converso opened the door and Moose went out. Converso couldn’t find Moose and was sad. Converso turned to the Internet for help.

Six days later, a woman told Converso that she saw a dog in a frozen(结冰的) river. Louis Nicolao went there quickly. Nicolao is a powerful swimmer. So he jumped in and swam his dog to safety(安全).

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1. What does the underlined word “powerful” mean?（词义猜测）

A    Bad.

B    Shy.

C    Good.

D    Hungry.