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：

★ Shade or shadow? “阴”和“影”的区别

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

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

★ White / blue-collar worker 白领，蓝领

★ 语法：易出错的英语惯用搭配

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

★ The office that starts at 9.06am 早上九点零六分准时开始工作

★ Samsung smartphone problem, zoo chimps feeling wild 三星智能手机问题，动物园的黑猩猩野性十足

★ Prize for cracking brain's 'feel good' system 三位科学家因破解大脑“奖赏系统”获奖

★ In good nick 品质好、没有损坏