a. 喜欢冒险的, 有进取心的, 危险的

adventure/venture/adventurous/event/prevent/invent/risk/expedition/pedestrian
记忆：
1. venture [ 5ventFE ] vent-ure 词根vent 表示到来；An undertaking that is dangerous, daring, or of uncertain outcome n. 冒险, 投机, 风险 v. 冒险, 冒昧 It’s a venture for the company to invest on such a project.公司投资于这样的工程是在冒险。 格言：Nothing ventured, nothing gained. 没有风险就没有收获。
2. adventure [ Ed5ventFE ] An unusual or exciting experience n. 冒险, 冒险的经历 v. 冒险 Have you read the Adventure of Tom Sawyer?你看过《汤姆索娅历险记》吗？
3. adventurous [Ed5ventFErEs] adj. 喜欢冒险的, 充满危险的 Tom was a clever and adventurous boy. 汤姆是个聪明而喜欢冒险的男孩。
4. event [ i5vent] e-vent 到来的事；n.事件, 事变 The event of kidnapping influenced the relation between the two countries.绑架事件影响到两国的关系。
5. prevent [ pri5vent ] pre-vent在到来之前防止； v.防止, 预防 How can we prevent the flood?我们怎样才能预防洪水？
6. invent [ in5vent] vt.发明, 创造 It’s said Thomas Edison invented hundreds of things.据说爱迪生发明了成百上千种东西。
7. risk [ risk ] vt. 冒. . . 的危险 (risk doing sth. ) n. 冒险, 风险 We cannot risk falling into the icy water. 我们不能冒掉进冰水里的风险。
8. expedition A journey undertaken by a group of people with a definite objective 词根ped表示“足”，ex-表示“外”，expedition, n. 远征, 探险队 They made a scientific expedition to the South Pole. 他们到南极作了一次科学探险。
9. pedestrian [ pe5destriEn] ped-e-strian 行走在大街上的人；n. 行人 The hurrying pedestrians paid no attention to his trouble. 急匆匆的行人没有理会他的麻烦。
另类阅读：
The company ventured to invest in adventure activities such as expedition to a lonely island. Many adventurous people are fond of them these days.