[音频]5. A) The discovery of a new species of snake. C) The finding of 2 new species of frog.B) The second trip to a small remote island. D) The latest test on a rare animal species.6. A) A poisonous snake attacked him on his field trip.B) He discovered a rare frog on a deserted island.C) A snake crawled onto his head in his sleep.D) He fell from a tall palm tree by accident.