A．6 million.　　　B．14 million.　　　C．8 million.

　　3．What are bioinformaticians'?

　　A．Those who combine computer skills with knowledge of biology.

　　B．Those who combine medical skills with knowledge of biology.

　　C．Those who combine tourism skills with knowledge of biology.

　　4．What is the most important character for the guides of adventure holidays?

　　A．Physical fitness.

　　B．An outgoing personality.

　　C．Both A and B.

　　【答案】　1.A　2.C　3.A　4.C