The people of China are working very hard to make concerted efforts to-考呗网

单选题The people of China are working very hard to make concerted efforts to invigorate the country.

[分析]形容词辨析
A.enjoyable令人愉快的，可享受的；B．persistent持久稳固的；C．encouraged被鼓励的；D．joint共同的，联合的，连带的；而concerted表示：商议定的，协定的，有关的，有牵连的；所以答案为D。

1The soldiers of peace-keeping force are tall, robust and, above all, resourceful.

2The footballer has been bouncing the ball for hours on end, and appears capable of more hours.

3Wherever one works, as a teacher, he or she should be erudite, patient and helpful.