单选题 {{B}}Passage Four{{/B}}

单选题 What is this lecture mainly about? a. Usual Species of fish. b. Characteristics of a unique sea animal. c. The harvest of fish eggs. d. Unusual species of horses.
【正确答案】 B
【答案解析】[听力原文]36-40 Today we are going to talk about a species of fish that is rather unique: Today's lecture is about sea horses, if you've seen a sea horse, you may have noted that it has a horse-like head attached to its body. The sea horse has a long snout that is good for sucking. Instead of scales like most fish, sea horses have skin that is stretched over bony plates. The body extends to a prehensile tail, meaning that the tail can be used to grasp. The sea horse may grasp sea grass or coral to keep it stable in a moving current. The sea horse has fins on its back that it can use to propel it through the water. However, sea horses aren't very good swimmers. They do not move quickly over great distances. The sea horse also has chest fins that it uses for stabilization. The chest fins help the sea horse float in an upright position. One particularly unique feature of sea horse is that only the male becomes pregnant. The female inserts ripe eggs into the male' pouch, where they are fertilized. The eggs become embedded in the pouch wall. [难点] 本题考查的是考生是否充分理解了文意。在通观了解全文后，不难选出答案是选项b。
单选题 What is the sea horse's prehensile tail used for? a. Propelling it through moving currents. b. Grasping sea grass or coral to stabilize it. c. Fending off attacks form predators. d. Moving food to its mouth, like an elephant's trunk.
【正确答案】 B
【答案解析】[难点] 本题考查的是事实细节。另外对题干出现的关键词“prehensile tail”可能不熟悉。选项a并不符合题意。选项c和d在逻辑上说的过去，若考生没抓住准确细节的话很容易误选。
单选题 What is the purpose of the sea horse's dorsal and pectoral fins? a. They allow it to maneuver effectively in a small areas. b. They allow it to swim quickly over long distances. c. Dorsal and pectoral fins have no function in sea horse. d. Their multi-colored fins attract shrimp and other food.
【正确答案】 A
【答案解析】[难点] 该题难度较大。题干关键词“dorsal and pectoral fins”对于考生来说不熟悉，但其实就是文中所提及的“fins on the back”和“chest fins”，需要考生自．己推理。另外正确选项a也并不是从原文可以直接听取的，是需要依靠逻辑推理的。选项b只是涉及了部分内容。
单选题 What is especially unique about sea horse? a. They make attractive ornaments in seashell shops. b. They can be kept as pets in home aquariums. c. They have much smaller scales than most fish. d. Only the male sea horse becomes pregnant.
【正确答案】 D
【答案解析】[难点] 该题涉及到最后一段。选项a、b、c均不符合原文内容，d为正确选项。
单选题 Among the following statements, which is tree about sea horse? a. The sea horse has a long snout that is not convenient for sucking. b. Sea horses have no scales at all. c. The sea horse is unable to grasp sea grass or coral. d. Sea horse can move very fast over long distance.
【正确答案】 B
【答案解析】[难点] 该题需要综观全文。如果听出“海马的嘴就是利于吸食”，则容易判断选项a错误。听出“海马尾巴的作用就是抓取物体”，则可以判断选项c错误。听到“海马并不是游泳健将”，可以判断海马移动并不很快，因此选项d错误。选项b正确。