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Câu hỏi:
Magnets
A solid object that has the power to attract iron and some metals is called a magnet. It does this through its magnetic field, a region of force surrounding it. The (33) the magnet, the more intense is the field. Objects that are attracted to the magnet feel a force (34) as ―magnetism ‖ when they are inside the magnetic field. This magnetic force can pass (35) some materials. Even a weak magnet will attract a pin to the other side of a (36) of paper, for example.Magnets come in (37) shapes. A familiar one is the curved horseshoes magnet.There are also bar magnets in the form (38) disc or a stubby cylinder. Everymagnet has (39) poles, called north and south, at opposite ends of it: at the twoends of a horseshoes magnet, for example, or on the two sides of a disc.Powerful magnets can be (40) by passing an electric current through wire coiledaround a piece of iron. The (41) is called and electromagnet. Magnets are (42)in many household and everyday devices. They are also commonly used inindustrial machinery, usually in the form of electromagnets.Question 33: A. smaller B. stronger C. weaker D. thinnerQuestion 34: A. mentioned B. called C. known D. saidQuestion 35: A. through B. away C. outside D. nextQuestion 36: A. pane B. block C. pile D. sheetQuestion 37: A. separate B. different C. unknown D. identicalQuestion 38: A. of B. in C. out D. upQuestion 39: A. many B. several C. two D. oneQuestion 40: A. found B. had C. done D. madeQuestion 41: A. ending B. result C. conclusion D. finalQuestion 42: A.used B. made C. lived D. unseen
Câu trả lời của bạn: 17:17 04/07/2021
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