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：

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

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

★ Shopping for ‘shoes’ 不同种类的“鞋”

★ In good nick 品质好、没有损坏

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

★ Lunchtime dilemma 午饭时间的“选择困难症”

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

★ UN female, New flag and Apollo 11 倡议提名女秘书长，新西兰换国旗和阿波罗11号再创历史

★ Europa moon 'spewing water jets' 木卫二表面“喷射出水汽”

★ White / blue-collar worker 白领，蓝领