【2017年整理】大学英语四级真题一.doc

模拟二 Part Ⅰ Writing Directions: For this part, you are allowed 30 minutes to write a short essay on the topic of The Bridge Between People. You should write at least 120 words following the outline given below. 1. 世界上有许多桥，人与人之间也有一座桥。 2. 人与人之间的桥很重要… 3. 如何维护好这座桥 Part Ⅱ Reading Comprehension ( Skimming and Scanning) Sharks Sharks are amazing fish that have been around since long before the dinosaurs existed. They live in waters all over the world, in every ocean, and even in some rivers and lakes. Sharks and bony fish Unlike bony fish, sharks have no bones; their skeleton is made of cartilage (软骨), which is a tough, fibrous substance, not nearly as hard as bone. Cartilage, a strong fibrous (纤维的) substance, is softer than bone; our nose and ears are made of cartilage. Sharks also have no swim bladder (unlike bony fish). Size There are many different species of sharks that range in size from the size of a persons hand to bigger than a bus. The Whale shark is the largest fish in the world; the basking shark is the second largest fish. Fully-grown sharks range in size from 7 inches long (the Spined Pygmy shark), up to 50 feet long. Most sharks are intermediate in size, and are about the same size as people, 5-7 feet long. Half of the shark species are under 39 inches long. Variety of sharks There are about 368 different species of sharks, which are divided into 30 families. These different families of sharks are very different in the way look, live, and eat. They have different shapes, sizes, color, fins, teeth, habitat, diet, personality, method of reproduction, and other attributes. Some types of shark are very. rare and some are quite common. The spiny dogfish shark is the most common shark. Body shapes Sharks have a variety of body shapes. Most sharks have streamlined (流线型的), Some sharks have an elongated body shape (e. g., cookiecutter sharks and wobbegongs). Sawsharks have elongated snouts, thresher sharks have a t