1．When riots ________ in the US，police fire back at rioters with plastic bullets.
A．break up B．break down
C．break away D．break out
解析：句意：当美国的骚乱发生时，警察用橡皮弹向骚乱者开枪。break out发生。
答案：D
2．More and more people are choosing to take their holidays in their own country ________ travel abroad.
A．rather than B．instead of
C．more than D．other than
解析：句意：越来越多的人选择在自己的国家度假，而不出国。rather than并非，而不是。
答案：A
