Of the thousands of different kinds of animals that exist in the world man has learned to make friends with an enormous number. Some are pets, and offer him companionship; some give protection, and some do hard work which man cannot do for himself. Dogs, which serve man in all four capacities(Korea and China are big dog eaters), are found in various breeds(动物品种) in all countries of the world. The Husky can live in the cold polar regions， and the Saluki is at home in the hottest parts of Central Africa. The inhabitants of certain countries are dependent for their very lives on the camel. In the West Indies the little donkey, strong and sure-footed, carrying heavy loads even in mountainous places, is a familiar sight.
Trained and tamed for many generations, domestic animals are not accustomed to roaming in search of food and shelter. They look to their masters to provide for their needs, and as long as these are supplied, they are content to do what their masters require.
All domestic animals need proper food. It must be suitable for them, sufficient in quantity, fresh and clean. Some people feed a pet dog or cat on odds and ends of table scraps, and then wonder why the animal seems listless(倦怠的) and dull. The quantity of food depends on the size of the animal and the amount of exercise it takes. Overfeeding is as bad as underfeeding. Containers for food and water must be washed regularly if the animal is to maintain good health.
Even well cared for animals may sometimes fall ill. If this happens, the wise master seeks the best advice he can get. All sorts of medicines and treatments are available for sick animals, and in some countries organizations exist to provide them free or at a cheap price. Useful, friendly, hardworking animals deserve to have some time, money and attention spent on their health.
66．What main idea does the author want to convey in the first paragraph?
A．There exists thousands of species of animals in the world.
B．Man came to establish a close relationship with a number of animals.
C．In some regions dogs seems to be more closely related to man.
D．Most animals existing in the world are kept by humans now.
67．Which of the following is a domestic animal, according to the passage?
A．A wolf kept in a zoo.
B．A pig raised for meat.
C．A tiger performing in circus.
D．A fish living in a river.
68．Which of the following is NOT true of dogs according to the passage?
A．They can act as friends, guards, and servants to man.
B．They have great adaptation for the environment.
C．There live a great variety of breeds of dogs on the globe.
D．The Husky and the Saluki are the strongest breeds ever known in the world.
69．To keep a domestic animal physically fit, its owner is advised ____.
A．not to hesitate to spend enormous amount of money on it
B．to be wise about their feeding
C．not to allow it to take too big amounts of exercise
D．to join some sort of pet-keeping organizations
70．Which of the following would be best TITLE for this passage?
A．Domesticated Animals – Man’s Best Friend
B．Proper Diet for Healthy Animals
C．The Advantages of Raising Domestic Animals
D．Some Tips on Pet-keeping
游离缺失，口腔情况良好，基牙健康，进行可摘局部义齿修复。在试戴义齿时，出现咬合低的现象。这一现象发生的原因是（）
关系错位