Mr. White lived in Florida and owned a company there. Some computers were made in his comp

any. He was nice to his employees(雇员)and often had a joke with them. They liked him very much and worked hard. So he paid them a lot.

The man had lots of work to do and often went to bed late at night. His friends advised him to do some exercise. He thought be was strong and didn't agree with them. But one day he fell in a faint(晕倒)while he was working in his office. He was sent to a hospital at once and the doctors examined him carefully. They found something was wrong with his heart and he had to be in hospi- tal. Several months later he returned home and asked his son to manage the company.

Once his daughter wanted to travel in Australia. The old man decided to go there with her. As he went to the country for the first time, he was interested in all. He played well, had a good sleep and visited some places of interest. And one day they visited a farm. It was big and beautiful. Cows and sheep could be seen everywhere.

Pointing to a cow, Mr. White asked, "What's this？"

"Haven't you seen a cow？" the guide asked surprised.

"Cow？" Mr. White said with a smile. "A cow in our country is five times(倍) as big as it!"

Having heard this, all the visitors began to laugh. After a while he saw a kangaroo (袋鼠)and asked again, "What's that？"

"It' s flea(跳蚤), sir. answered the guide.

The employees worked hard because________.

A．Mr. White was kind to them

B．Mr. White had a company

C．Mr. White often had a joke with them

D．they liked to use computers