C. simplest

　　D. biggest

　　【解析】选A。前后照应题。根据下文的and will require an enormous consumption of energy—a great big push. 可知, 你开始事业成功的第一步是最难的。

　　19. A. while B. if

　　C. unless

　　D. until

　　【解析】选B。逻辑推理题。如果你在开始阶段坚持下来……。

　　20. A. useless B. careless

　　C. wireless

　　D. priceless

　　【解析】选A。逻辑推理题。根据下文的everything gets easier and easier and your results get bigger and bigger. 可知, 看起来几乎是无用的, 但坚持下来就会越来越容易。

　　. 阅读理解

　　Researchers are placing robotic dogs in the homes of lonely old people to determine whether they can improve the quality of life for humans. Alan Beck, an expert in human-animal relationship, and Nancy Edwards, a professor of nursing, are leading the animal-assisted study concerning the influence of robotic dogs on old people’s depression, physical activity, and life satisfaction. “No one will argue that an older person is better off being more active, challenged, or stimulated(刺激), ”Edwards points out. “The problem is how we promote that, especially for those without friends or help. A robotic dog could be a solution. ”

　　In the study, the robot, called AIBO, is placed for six weeks in the houses of some old people who live alone. Before placing AIBO in the home, researchers will collect baseline data for six weeks. These old people will keep a diary to note their feelings and activities before and after AIBO. Then, the researchers will review the data to determine if it has inspired any changes in the life of its owner.

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