18.【答案】A

　　【解析】本句为一个时间状语从句。当工作能给他们提供一个挑战的机会，而且最后他们能说“我成功了”的时候，他们会有一种成就感。

　　19.【答案】D

　　【解析】本题考查固定词组的搭配。make it成功。

　　20.【答案】C

　　【解析】 本句是对本段大意所进行的总结。根据上下文可知，在工作之后，他们能体会到自我成功的价值。

　　阅读下列短文, 从给的四个选项 (A、B、C和D) 中, 选出最佳选项。

　　(2017·辽宁，A)

　　China is a land of bicycles. At least it was back in 1992 when I traveled the country. Back then everyone seemed to be riding a bicycle. Millions of them, all black. Cars were rare. Yet since my arrival in Beijing last year, I've found the opposite is true. There are millions of cars. However, people still use their bicycles to get around. For many, it's the easiest and cheapest way to travel today. Bicycles also come in different colors—silver, green, red, blue, yellow, whatever you want.

　　It's fun watching people biking. They rush quickly through crossroads, move skillfully through traffic, and ride even on sidewalks(人行道). Bicycles allow people the freedom to move about that cars just can't provide.

　　Eager to be part of this aspect of Chinese culture, I decided to buy a bicycle. Great weather accompanied my great buy. I immediately jumped up on my bicycle seat and started home.

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