【正确答案】 B

【答案解析】[听力原文]23-25
W: Hi, Bill, how is it going?
M: Oh, hi, Jane. I'm OK. How about you?
W: You can probably tell just by looking at me. I'm really busy. Hey, what are you reading?
M: A pretty interesting article. My biology professor assigned it, and I thought I would just look it over. But I got really involved in it. It's about endangered species.
W: That sounds pretty interesting. I'm getting frustrated with the two research papers I'm struggling with.
M: Oh?
W: And can you believe they are both due on the same day?
M: That's tough.
W: I'll get through it. So what's this you are reading?
M: Well, it's basically about the choices conservationists are faced with. You know, these days when funding is so hard to come by.
W: Wait a minute. Does it focus on biology or economics?
M: Both. Conservationists don't have enough funding to save every endangered species in the world, so they have to decide based on what would be lost if a species became extinct.
W: Can you give me an example of what you mean?
M: Take for instance, two animals, the spotted owl and the tailed toad. The article says the toad is unique. It has no relatives. But there are a lot of varieties of owls.
W: So, if that toad became extinct, we'd lose an important link in the chain of evolution, right? M: Exactly. But that isn't so for the owl. So for conservationists, it might be a clear choice Which animal to save.
W: I see. I am glad I don't have to make that kind of decision. Aren't you?
23．Why does the woman say she's frustrated?

[解析] 细节题。从听力原文I'm getting frustrated with the two research papers I'm struggling with....they are both due on the same day.可知女士的两篇论文在同一天都到期要交，所以很灰心。due作为形容词表示“到期的”。[B]与此相符合，assignments≈two research papers。

【正确答案】 D

【答案解析】[听力原文]
What problems do conservationists have?

[解析] 细节题。听力原文中提到Conservationists don't have enough funding to save every endangered species in the world，so they have to decide based on what would be lost订a species became extinct．，可见他们面临资金短缺问题。

【正确答案】 C

【答案解析】[听力原文]
What can be inferred about the tailed toad?

[解析] 细节题。从对话中我们可知the toad is unique-It has no relatives.,与[A]矛盾。从对话we'd lose an important link in the chain of evolution我们可知toad在进化链中很重要，所以排除[D]；从对话中我们知道toad快灭绝，所以不可能数量上涨，[B]电不正确。既然toad是唯一的物种，并且面临灭绝，当然如果没有专门的挽救措施，它可能存活不了，[C]正确。