单项选择题

A. He works as a teacher.
B. He has a nice ear.
C. He is living in London.
D. He has a small family.
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填空题
The word horsepower was first used two hundred years ago. James Watt had made the world’s first widely used (11) . He had no way of telling people exactly how powerful it was, for (12) there were no units for measuring power. Watt decided to find out how much work one strong horse could do in (13) . He called that unit one horsepower. With this unit he could measure the work his steam engine could do. He discovered that a horse lift a (14) weight 10 feet in one minute. Because his engine did (15) as much as the horse, Watt called it a ten-horsepower engine.
填空题
The baby ______ (cry) non-stop for the past hour.
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