3. True or false: Challenge prizes have become popular only recently.

False. Challenge prizes were most popular during the 18th and 19th centuries, but have received renewed interest more recently.

4. According to Tris Dyson, what is the danger of challenge prizes?

According to Tris Dyson, creating a challenge prize incentivises people to solve a problem where there is no demand.

5. Which word in the text means ‘not planned or prepared’?

Impromptu. (The crowd acts like an impromptu think tank.)

2.  请在不参考课文的情况下完成下列练习。选择一个意思合适的单词填入句子的空格处。

1. It's a good idea but I don't think it will be cost-effective to make so we all need to think outside the box and come up with a new plan.

2. You have 30 minutes to come up with the answer. You may begin your exam, now.

3. Abstract concepts such as family, freedom and duty vary from culture to culture.

4. It was only once we had implemented the solution that it threw up issues we hadn't anticipated.

5. It was only once we had implemented the solution that raised difficulties we had overlooked.

【The problem-solving prizes 为鼓励创新和解决问题设置“挑战奖”】相关文章：

★ In good nick 品质好、没有损坏

★ The problem with big brains 聪明大脑所带来的问题

★ Convey, convert, transform 和 divert 四个含有“转换”意思的单词

★ The changing nature of money 不断更新演变的货币

★ Reunion? Count me out! 重聚? 别算上我!

★ 小测验 — 和“欢笑”有关的表达

★ Shade or shadow? “阴”和“影”的区别

★ Compulsory, mandatory 与 compulsive 三个单词的区别

★ The fear of missing out 错失恐惧症

★ Phelps makes history and marine species 菲尔普斯创造历史，海洋新物种