A、They’re partners. B、They’ re roommates. C、They’re classmates. D、They’re cousins. C综合判断题。由原文一开头男士与女士的对话可知，两人在谈论他们马上要交的论文，可知两个人是

M: Hi, Sue, where have you been?
W: Oh, Hi, Dan, I was just at the library. I have to hand in my biology paper tomorrow.
M: Tomorrow? Oh, no, I thought it wasn’ t due till Monday.
W: Oh. Don’ t worry. It is due Monday. But I’ m going away for the weekend and won’ t be back till Monday night.
M: Oh, where are you going?
W: California. We’ re having a family party.
M: Wow. That’ s great.
W: Yes. So have you started working on your biology paper?
M: Yeah. I’m doing it on bees and how they’re able to recognize whether another bee is related to them.
W: How can they tell?
M: They use their sense of smell. The sweat bees guard their nests this way. If another bee approaches the nest, the guard determines if the new bee is familiar. If it is, it’s allowed to enter.
W: Interesting topic! Can we talk about it next time when you finish it?
M: Of course! And have a nice weekend with your family!
W: Thanks! See you!
M: See you! Questions 9 to 12 are based on the conversation you have just heard.
9. What is the relationship between the speakers?
10. Why was the man worried at first?
11. According to the man, how do some bees use their sense of smell?
12. What will the man probably do over the weekend?