几个 英语考试题 请高手帮忙

答案和解释如下，可保证100%正确！

2. The car, at least as we know it, is on the way out, because its exhaust () a threat to the environment.
A. originates 发源；起源于；发起
B. poses 提出
C. offends 冒犯
D. paralyzes 使失去功能，使瘫痪
句意：据我们所知，那种汽车被逐渐淘汰了，因为它产生的废气对环境污染较大。

本题答案 B poses -- pose a threat to 对... 造成威胁

3.The ball was () out of his grasp by a player on the other team.
A. wrenched 扭；拧；猛拉
B. contested 比赛
C. interrupted 打断；使中断
D. sucked 吮吸
句意：猛的一下，对方球员将球抢走/带出他的控制范围。

本题答案 A. wrenched

4. The United Nations was supposed to () the role of global peach-keeper.
A. contend 斗争；主张；声称
B. nurture 培育
C. carve 雕刻
D. undertake 扮演；从事
句意：大家认为，联合国扮演维护全球和平的角色。

本题答案 D undertake --- undertake the role of 担当/扮演...角色

5. Dr. Light, who is () to be one of the best surgeons in L