【正确答案】 D

【答案解析】[听力原文]
W: Hi, Tom.
M: Hi, Judy. Haven't seen you for weeks. Where have you been?
W: In Florida.
M: Vacationing while the rest of us have been studying on campus in the February cold?
W: Not exactly. I spent most of my time underwater.
M: I don't understand.
W: I was on a special field trip. I went with my marine biology class.
M: So you went deep water diving. What were yon looking for, sunken treasures?
W: You might say so. The sea is full of treasures, all kinds of strange fascinating organisms. Our class concentrated on studying plankton, which is small form of plant and animal life living in water.
M: I thought plankton is too small to be seen.
W: That's a common misconception. The term plankton covers a very wide variety of freely floating plants and animals.
M: I hear most plankton is transparent, aren't they?
W: Yes. Most plankton has transparent tissues as a protective disguise, such as jellyfish. It makes them practically invisible to predators.
M: But not invisible to your biology class, I hope.
W: By concentrating, I was able to see the outlines of lots of different plants and animals. In fact, our professor even took photographs of Greeber Quadata, which are small oceanic snails.
M: How will the snails show up in the photographs if they are transparent?
W: We sprayed Greeber Quadata with a harmless green dye. Since particles of the dye stuck to their tissues, the snails appeared in green outline in the photographs.
M: That sounds like an interesting trip. But I think if I'd been in Florida in February, I'd much rather spend my time just swimming and lying in the sun.

How did Judy spend most of her time in Florida?

男士说有几个星期没有看见女士了，问她去了哪里，女士说去了佛罗里达，而且她把大部分时间都花在了水下。对话后面男士提到了深海潜水，得到了女士的肯定答复，因此女士在佛罗里达的大部分时间在深海潜水，故答案为D。