C．clarify D．switch

答案　A

解析　句意为：为了巩固他在这个国家的地位，他任命他的好朋友亨利作为军队的统领。strengthen加强；sponsor赞助；clarify澄清，使......清楚；switch转换，转化。

2．As you laugh，the muscles participating in the laugh become active.

当你笑的时候，参与笑的肌肉变得活跃起来。

[归纳拓展]

(1)participate vi.参加，参与

participate in参加，参与

(2)participation n．参加，参与

(3)participant n．参与者

[语境助记]

(1)A lot of countries participated in the Olympic Games in Rio in 2016.

很多国家参加了2016年在里约举办的奥运会。

(2)The scheme aims to encourage participation in sporting activities.

这个方案旨在鼓励大众参与体育活动。

[题组训练]

用participate的适当形式填空

(1)You can enjoy a 50% saving on room rates at all participating hotels.

(2)We would like to see more participation by younger people.

(3)It was argued that he was a willing participant.

3．Enjoying a funny comedy or reading some jokes will drive away your negative feelings and make you feel much better.享受搞笑的喜剧或阅读一些笑话会赶走你的负面情绪，让你感觉好很多。

[归纳拓展]

drive away赶走；驱赶；把(车)开走

drive off 开走；赶走；驱散；击退

drive sb.＋adj.使人......

drive sb. to do sth.迫使某人做某事

[语境助记]

(1)The fresh air seemed to drive away all his sadness.