A.A trial piece of equipment of an airplane.B.A temporary substitute for a spare
A trial piece of equipment of an airplane.
B. A temporary substitute for a spare part.
C. A temporary renting of a piece of equipment.
D. The maintenance of some parts of a plane.
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Questions 13 to 15 are based on the conversation you have just heard.
A. They are better sheltered from all the outside temptations.
B. They are usually more motivated to compete with their peers.
C. They have more opportunities to develop their leadership skills.
D. They take an active part in more extracurricular activities.
The crises Facebook is facing_____
A. have been disclosed in the IPO prospectus
B. are the universal risks Wall Street confronts
C. disappoint its faithful users
D. have existed for a long time
More and more remodeled kitchens use LED lighting, because LED bulbs use less electricity
盾皮鱼类(Placodermi)是大约3.95亿年前出现于泥盆纪早期的另一类______鱼类，被认为是______的祖先。
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