Questions 22 to 25 are based on the conversation you have just heard.

A．Because he could make big money by doing this.
B．Because he once was helped by a stranger on highway.
C．Because people would help him fuel his car.
D．Because it is the assignment from his boss.

A．You will feel weak and tired when you get the flu, but not cold.
B．You will cough frequently and forcefully when you get the flu, but not cold.
C．You will have chills and a sore throat when you get the flu, but not cold.
D．You will suddenly suffer from it when you get the flu, but not cold.